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src='https://blogger.googleusercontent.com/tracker/8247527494114144048-1623666526471671217?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/IMIHXpbgyXeOzat-eSBCl7d_3_8/0/da"><img src="http://feedads.g.doubleclick.net/~a/IMIHXpbgyXeOzat-eSBCl7d_3_8/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/IMIHXpbgyXeOzat-eSBCl7d_3_8/1/da"><img src="http://feedads.g.doubleclick.net/~a/IMIHXpbgyXeOzat-eSBCl7d_3_8/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/xpCOeclhfHs" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/12/seminar-topicsbtech-seminars.htmltag:blogger.com,1999:blog-8247527494114144048.post-91041230230226774662010-01-29T06:10:00.000-08:002010-01-29T06:29:54.024-08:002010-01-29T06:29:54.024-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><br />19. Given:<br />class Mixer {<br />Mixer() { }<br />Mixer(Mixer m) { m1 = m; }<br />Mixer m1;<br />public static void main(String[] args) {<br />Mixer m2 = new Mixer();<br />Mixer m3 = new Mixer(m2); m3.go();<br />Mixer m4 = m3.m1; m4.go();<br />Mixer m5 = m2.m1; m5.go();<br />}<br />void go() { System.out.print("hi "); }<br />}<br />What is the result?<br />A. hi<br />B. hi hi<br />C. hi hi hi<br />D. Compilation fails<br />E. hi, followed by an exception<br />F. hi hi, followed by an exception<br />Answer:<br />-> F is correct. The m2 object’s m1 instance variable is never initialized, so when m5 tries to use it a NullPointerException is thrown.<br />-> A, B, C, D, and E are incorrect based on the above. (Objective 7.3)<br />20. Given:<br />1. class Zippy {<br />2. String[] x;<br />3. int[] a [] = {{1,2}, {1}};<br />4. Object c = new long[4];<br />5. Object[] d = x;<br />6. }<br />What is the result?<br />A. Compilation succeeds.<br />B. Compilation fails due only to an error on line 3.<br />C. Compilation fails due only to an error on line 4.<br />D. Compilation fails due only to an error on line 5.<br />E. Compilation fails due to errors on lines 3 and 5.<br />F. Compilation fails due to errors on lines 3, 4, and 5.<br />Answer:<br />-> A is correct, all of these array declarations are legal. Lines 4 and 5 demonstrate that arrays can be cast.<br />->B, C, D, E, and F are incorrect because this code compiles. (Objective 1.3)<br />21. Given:<br />class Fizz {<br />int x = 5;<br />public static void main(String[] args) {<br />final Fizz f1 = new Fizz();<br />Fizz f2 = new Fizz();<br />Fizz f3 = FizzSwitch(f1,f2);<br />System.out.println((f1 == f3) + " " + (f1.x == f3.x));<br />}<br />static Fizz FizzSwitch(Fizz x, Fizz y) {<br />final Fizz z = x;<br />z.x = 6;<br />return z;<br />} }<br />What is the result?<br />A. true true B. false true C. true false<br />D. false false E. Compilation fails. F. An exception is thrown at runtime.<br />Answer:<br />->A is correct. The references f1, z, and f3 all refer to the same instance of Fizz. The final modifier assures that a reference variable cannot be referred to a different object, but final doesn’t keep the object’s state from changing.<br />->B, C, D, E, and F are incorrect based on the above. (Objective 7.3)<br />22. Given:<br />class Knowing {<br />static final long tooth = 343L;<br />static long doIt(long tooth) {<br />System.out.print(++tooth + " ");<br />return ++tooth;<br />}<br />public static void main(String[] args) {<br />System.out.print(tooth + " ");<br />final long tooth = 340L;<br />new Knowing().doIt(tooth);<br />System.out.println(tooth);<br />} }<br />What is the result? <br />A. 343 340 340 B. 343 340 342 C. 343 341 342<br />D. 343 341 340 E. 343 341 343 F. Compilation fails.<br />G. An exception is thrown at runtime.<br />Answer:<br />-> D is correct. There are three different long variables named tooth. Remember that you can apply the final modifier to local variables, but in this case the 2 versions of tooth marked final are not changed. The only tooth whose value changes is the one not marked final. This program demonstrates a bad practice known as shadowing.<br />->A, B, C, E, F, and G are incorrect based on the above. (Objective 7.3)<br />23. Given:<br />1. class Bigger {<br />2. public static void main(String[] args) {<br />3. // insert code here<br />4. }<br />5. }<br />6. class Better {<br />7. enum Faster {Higher, Longer};<br />8. }<br />Which, inserted independently at line 3, will compile? (Choose all that apply.)<br />A. Faster f = Faster.Higher;<br />B. Faster f = Better.Faster.Higher;<br />C. Better.Faster f = Better.Faster.Higher;<br />D. Bigger.Faster f = Bigger.Faster.Higher;<br />E. Better.Faster f2; f2 = Better.Faster.Longer;<br />F. Better b; b.Faster = f3; f3 = Better.Faster.Longer;<br />Answer:<br />-> C and E are correct syntax for accessing an enum from another class.<br />->A, B, D, and F are incorrect syntax.<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-9104123023022677466?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/jHdDXCD3JpXQztcbenM-cH9vc3o/0/da"><img src="http://feedads.g.doubleclick.net/~a/jHdDXCD3JpXQztcbenM-cH9vc3o/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/jHdDXCD3JpXQztcbenM-cH9vc3o/1/da"><img src="http://feedads.g.doubleclick.net/~a/jHdDXCD3JpXQztcbenM-cH9vc3o/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/EQZGo9xhtTE" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.htmltag:blogger.com,1999:blog-8247527494114144048.post-52695997657198287372010-01-29T06:09:00.000-08:002010-01-29T06:30:24.318-08:002010-01-29T06:30:24.318-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><br />15. Given:<br />class Scoop {<br />static int thrower() throws Exception { return 42; }<br />public static void main(String [] args) {<br />try {<br />int x = thrower();<br />} catch (Exception e) {<br />x++;<br />} finally {<br />System.out.println("x = " + ++x);<br />} } }<br />What is the result?<br />A. x = 42<br />B. x = 43<br />C. x = 44<br />D. Compilation fails.<br />E. The code runs with no output.<br />Answer:<br />->D is correct, the variable x is only in scope within the try code block, it’s not in scope inthe catch or finally blocks. <br />->A, B, C, and E is are incorrect based on the above.<br />16. Given:<br />class Alien {<br />String invade(short ships) { return "a few"; }<br />String invade(short... ships) { return "many"; }<br />}<br />class Defender {<br />public static void main(String [] args) {<br />System.out.println(new Alien().invade(7));<br />} }<br />What is the result?<br />A. many<br />B. a few<br />C. Compilation fails.<br />D. The output is not predictable.<br />E. An exception is thrown at runtime.<br />Answer:<br />->C is correct, compilation fails. The var-args declaration is fine, but invade takes a short,so the argument 7 needs to be cast to a short. With the cast, the answer is B, 'a few'.<br />->A, B, D, and E are incorrect based on the above. (Objective 1.3)<br /><br />17. Given:<br />1. class Dims {<br />2. public static void main(String[] args) {<br />3. int[][] a = {{1,2,}, {3,4}};<br />4. int[] b = (int[]) a[1];<br />5. Object o1 = a;<br />6. int[][] a2 = (int[][]) o1;<br />7. int[] b2 = (int[]) o1;<br />8. System.out.println(b[1]);<br />9. } }<br />What is the result?<br />A. 2<br />B. 4<br />C. An exception is thrown at runtime<br />D. Compilation fails due to an error on line 4.<br />E. Compilation fails due to an error on line 5.<br />F. Compilation fails due to an error on line 6.<br />G. Compilation fails due to an error on line 7.<br />Answer:<br />->C is correct. A ClassCastException is thrown at line 7 because o1 refers to an int[][]not an int[]. If line 7 was removed, the output would be 4.<br />->A, B, D, E, F, and G are incorrect based on the above. (Objective 1.3)<br />18. Given:<br />class Eggs {<br />int doX(Long x, Long y) { return 1; }<br />int doX(long... x) { return 2; }<br />int doX(Integer x, Integer y) { return 3; }<br />int doX(Number n, Number m) { return 4; }<br />public static void main(String[] args) {<br />new Eggs().go();<br />}<br />void go() {<br />short s = 7;<br />System.out.print(doX(s,s) + " ");<br />System.out.println(doX(7,7));<br />} }<br />What is the result?<br />A. 1 1<br />B. 2 1<br />C. 3 1<br />D. 4 1<br />E. 2 3<br />F. 3 3<br />G. 4 3<br />Answer:<br />-> G is correct. Two rules apply to the first invocation of doX(). You can’t widen and then box in one step, and var-args are always chosen last. Therefore you can’t widen shorts to either ints or longs, and then box them to Integers or Longs. But you can box shorts to Shorts and then widen them to Numbers, and this takes priority over using a var-args method. The<br />second invocation uses a simple box from int to Integer.<br />-> A, B, C, D, E, and F are incorrect based on the above. (Objective 3.1)<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-5269599765719828737?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/QoN1PSQF2gZW7FiB0eYyvp3Io4s/0/da"><img src="http://feedads.g.doubleclick.net/~a/QoN1PSQF2gZW7FiB0eYyvp3Io4s/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/QoN1PSQF2gZW7FiB0eYyvp3Io4s/1/da"><img src="http://feedads.g.doubleclick.net/~a/QoN1PSQF2gZW7FiB0eYyvp3Io4s/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/FyMtqYYvSLY" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.htmltag:blogger.com,1999:blog-8247527494114144048.post-30303661723692379052010-01-29T06:08:00.000-08:002010-01-29T06:31:16.750-08:002010-01-29T06:31:16.750-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><br />12. Place the fragments into the code to produce the output 33. Note, you must use each fragment exactly once.<br />CODE:<br />class Incr {<br />public static void main(String[] args) {<br />Integer x = 7;<br />int y = 2;<br />x ___ ___;<br />___ ___ ___;<br />___ ___ ___;<br />___ ___ ___;<br />System.out.println(x);<br />}<br />}<br />FRAGMENTS:<br /> <br />Answer:<br />class Incr {<br />public static void main(String[] args) {<br />Integer x = 7;<br />int y = 2;<br />x *= x;<br />y *= y;<br />y *= y;<br />x -= y;<br />System.out.println(x);<br />}<br />}<br />Yeah, we know it’s kind of puzzle-y, but you might encounter something like it on the real exam.<br /><br />13. Given:<br />1. class Maybe {<br />2. public static void main(String[] args) {<br />3. boolean b1 = true;<br />4. boolean b2 = false;<br />5. System.out.print(!false ^ false);<br />6. System.out.print(" " + (!b1 & (b2 = true)));<br />7. System.out.println(" " + (b2 ^ b1));<br />8. }<br />9. }<br />Which are true?<br />A. Line 5 produces true.<br />B. Line 5 produces false.<br />C. Line 6 produces true.<br />D. Line 6 produces false.<br />E. Line 7 produces true.<br />F. Line 7 produces false.<br />Answer:<br />-> A , D, and F is correct. The ^ (xor) returns true if exactly one operand is true. The ! inverts the operand’s boolean value. On line 6 b2 = true is an assignment not a comparison, and it’s evaluated because & does not short-circuit it.<br />-> B, C, and E are incorrect based on the above.<br />14. Given:<br />class Sixties {<br />public static void main(String[] args) {<br />int x = 5;<br />int y = 7;<br />System.out.print(((y * 2) % x));<br />System.out.print(" " + (y % x));<br />}<br />}<br />What is the result?<br />A. 1 1<br />B. 1 2<br />C. 2 1<br />D. 2 2<br />E. 4 1<br />F. 4 2<br />G. Compilation fails.<br />H. An exception is thrown at runtime.<br />Answer:<br />->F is correct. The % (remainder a.k.a. modulus) operator returns the remainder of a<br />division operation.<br />->A, B, C, D, E, G, and H are incorrect based on the above.<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-3030366172369237905?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/M0mJ-Ty6bRLhGk4gn3ZwGd2_D9A/0/da"><img src="http://feedads.g.doubleclick.net/~a/M0mJ-Ty6bRLhGk4gn3ZwGd2_D9A/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/M0mJ-Ty6bRLhGk4gn3ZwGd2_D9A/1/da"><img src="http://feedads.g.doubleclick.net/~a/M0mJ-Ty6bRLhGk4gn3ZwGd2_D9A/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/Fa9LMmqar_k" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.htmltag:blogger.com,1999:blog-8247527494114144048.post-49286747067330161562010-01-29T06:06:00.000-08:002010-01-29T06:31:38.336-08:002010-01-29T06:31:38.336-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/>9. Given:<br />class Foozit {<br />public static void main(String[] args) {<br />Integer x = 0;<br />Integer y = 0;<br />for(Short z = 0; z < 5; z++)<br />if((++x > 2) || (++y > 2))<br />x++;<br />System.out.println(x + " " + y);<br />} }<br />What is the result?<br />A. 5 1 B. 5 2 C. 5 3 D. 8 1<br />E. 8 2 F. 8 3 G. 10 2 H. 10 3<br />Answer:<br />-> E is correct. The first two times the if test runs, both x and y are incremented once (the x++ is not reached until the third iteration). Starting with the third iteration of the loop, y is never touched again, because of the short-circuit operator.<br />-> A, B, C, D, F, G, and H are incorrect based on the above.<br />10. Given:<br />class Titanic {<br />public static void main(String[] args) {<br />Boolean b1 = true;<br />boolean b2 = false;<br />boolean b3 = true;<br />if((b1 & b2) | (b2 & b3) & b3)<br />System.out.print("alpha ");<br />if((b1 = false) | (b1 & b3) | (b1 | b2))<br />System.out.print("beta ");<br />} }<br />What is the result?<br />A. beta<br />B. alpha<br />C. alpha beta<br />D. Compilation fails.<br />E. No output is produced.<br />F. An exception is thrown at runtime.<br />Answer:<br />-> E is correct. In the second if test, the leftmost expression is an assignment, not<br />a comparison. Once b1 has been set to false, the remaining tests are all false.<br />-> A, B, C, D, and F are incorrect based on the above.<br />11. Given:<br />class Feline {<br />public static void main(String[] args) {<br />Long x = 42L;<br />Long y = 44L;<br />System.out.print(" " + 7 + 2 + " ");<br />System.out.print(foo() + x + 5 + " ");<br />System.out.println(x + y + foo());<br />}<br />static String foo() { return "foo"; }<br />}<br />What is the result?<br />A. 9 foo47 86foo<br />B. 9 foo47 4244foo<br />C. 9 foo425 86foo<br />D. 9 foo425 4244foo<br />E. 72 foo47 86foo<br />F. 72 foo47 4244foo<br />G. 72 foo425 86foo<br />H. 72 foo425 4244foo<br />I. Compilation fails.<br />Answer:<br />-> G is correct. Concatenation runs from left to right, and if either operand is a String, the operands are concatenated. If both operands are numbers they are added together. Unboxing works in conjunction with concatenation.<br />-> A, B, C, D, E, F, H, and I are incorrect based on the above.<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-4928674706733016156?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/lymxrmMi6chjDPDJoWjcYmcrJus/0/da"><img src="http://feedads.g.doubleclick.net/~a/lymxrmMi6chjDPDJoWjcYmcrJus/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/lymxrmMi6chjDPDJoWjcYmcrJus/1/da"><img src="http://feedads.g.doubleclick.net/~a/lymxrmMi6chjDPDJoWjcYmcrJus/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/b8j5Kv7jmLY" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.htmltag:blogger.com,1999:blog-8247527494114144048.post-13595641049515121782010-01-29T06:04:00.000-08:002010-01-29T06:06:26.036-08:002010-01-29T06:06:26.036-08:00Question: 04<br />Given:<br />42. public class ClassA {<br />43. public int getValue() {<br />44.int value=0;<br />45. boolean setting = true;<br />46. String title=”Hello”;<br />47. if (value || (setting && title == “Hello”)) { return 1; }<br />48. if (value == 1 & title.equals(”Hello”)) { return 2; }<br />49. }<br />50. }<br />And:<br />70. ClassA a = new ClassA();<br />71. a.getValue();<br />What is the result?<br />A. 1<br />B. 2<br />C. Compilation fails.<br />D. The code runs with no output.<br />E. An exception is thrown at runtime.<br />Answer: C<br />5. Given:<br />class Hexy {<br />public static void main(String[] args) {<br />Integer i = 42;<br />String s = (i<40)?"life":(i>50)?"universe":"everything";<br />System.out.println(s);<br />} }<br />What is the result?<br />A. null<br />B. life<br />C. universe<br />D. everything<br />E. Compilation fails.<br />F. An exception is thrown at runtime.<br />Answer:<br />-> D is correct. This is a ternary nested in a ternary with a little unboxing thrown in.<br />Both of the ternary expressions are false.<br />-> A, B, C, E, and F are incorrect based on the above.<br />6. Given:<br />1. class Example {<br />2. public static void main(String[] args) {<br />3. Short s = 15;<br />4. Boolean b;<br />5. // insert code here<br />6. }<br />7. }<br />Which, inserted independently at line 5, will compile? (Choose all that apply.)<br />A. b = (Number instanceof s);<br />B. b = (s instanceof Short);<br />C. b = s.instanceof(Short);<br />D. b = (s instanceof Number);<br />E. b = s.instanceof(Object);<br />F. b = (s instanceof String);<br />Answer:<br />-> B and D correctly use boxing and instanceof together.<br />-> A is incorrect because the operands are reversed. C and E use incorrect instance of syntax. F is wrong because Short isn't in the same inheritance tree as String.<br /><br /><br />7. Given:<br />1. class Comp2 {<br />2. public static void main(String[] args) {<br />3. float f1 = 2.3f;<br />4. float[][] f2 = {{42.0f}, {1.7f, 2.3f}, {2.6f, 2.7f}};<br />5. float[] f3 = {2.7f};<br />6. Long x = 42L;<br />7. // insert code here<br />8. System.out.println("true");<br />9. }<br />10. }<br />And the following five code fragments:<br />F1. if(f1 == f2)<br />F2. if(f1 == f2[2][1])<br />F3. if(x == f2[0][0])<br />F4. if(f1 == f2[1,1])<br />F5. if(f3 == f2[2])<br />What is true?<br />A. One of them will compile, only one will be true.<br />B. Two of them will compile, only one will be true.<br />C. Two of them will compile, two will be true.<br />D. Three of them will compile, only one will be true.<br />E. Three of them will compile, exactly two will be true.<br />F. Three of them will compile, exactly three will be true.<br />Answer:<br />-> D is correct. Fragments F2, F3, and F5 will compile, and only F3 is true.<br />-> A, B, C, E, and F are incorrect. F1 is incorrect because you can’t compare a primitive to an array. F4 is incorrect syntax to access an element of a two-dimensional array.<br />8. Given:<br />class Fork {<br />public static void main(String[] args) {<br />if(args.length == 1 | args[1].equals("test")) {<br />System.out.println("test case");<br />} else {<br />System.out.println("production " + args[0]);<br />} } }<br />And the command-line invocation:<br />java Fork live2<br />What is the result?<br />A. test case<br />B. production<br />C. test case live2<br />D. Compilation fails.<br />E. An exception is thrown at runtime.<br />Answer:<br />->  E is correct. Because the short circuit (||) is not used, both operands are evaluated. Since args[1] is past the args array bounds, an ArrayIndexOutOfBoundsException is thrown.<br />-> A, B, C, and D are incorrect based on the above.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-1359564104951512178?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/q_4clzk7SliKNCC2FCu0JH7BTOo/0/da"><img src="http://feedads.g.doubleclick.net/~a/q_4clzk7SliKNCC2FCu0JH7BTOo/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/q_4clzk7SliKNCC2FCu0JH7BTOo/1/da"><img src="http://feedads.g.doubleclick.net/~a/q_4clzk7SliKNCC2FCu0JH7BTOo/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/HqxOguuPL6I" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.htmltag:blogger.com,1999:blog-8247527494114144048.post-7154777159300604742010-01-29T06:00:00.000-08:002010-01-29T06:32:03.555-08:002010-01-29T06:32:03.555-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><br />6. Given:<br />1. class Example {<br />2. public static void main(String[] args) {<br />3. Short s = 15;<br />4. Boolean b;<br />5. // insert code here<br />6. }<br />7. }<br />Which, inserted independently at line 5, will compile? (Choose all that apply.)<br />A. b = (Number instanceof s);<br />B. b = (s instanceof Short);<br />C. b = s.instanceof(Short);<br />D. b = (s instanceof Number);<br />E. b = s.instanceof(Object);<br />F. b = (s instanceof String);<br />Answer:<br />-> B and D correctly use boxing and instanceof together.<br />-> A is incorrect because the operands are reversed. C and E use incorrect instance of syntax. F is wrong because Short isn't in the same inheritance tree as String.<br />Q: 01 Given:<br />11. public class Test {<br />12. public static void main(String [] args) {<br />13. int x = 5;<br />14. boolean b1 = true;<br />15. boolean b2 = false;<br />16.<br />17. if ((x == 4) && !b2 )<br />18. System.out.print("1 ");<br />19. System.out.print("2 ");<br />20. if ((b2 = true) && b1 )<br />21. System.out.print("3 ");<br />22. }<br />23. }<br /><br />What is the result?<br />A. 2<br />B. 3<br />C. 1 2<br />D. 2 3<br />E. 1 2 3<br />F. Compilation fails.<br />G. An exception is thrown at runtime.<br />Answer: D<br />Q: 02 Given the command line java Pass2 and:<br />15. public class Pass2 {<br />16. public void main(String [] args) {<br />17. int x = 6;<br />18. Pass2 p = new Pass2();<br />19. p.doStuff(x);<br />20. System.out.print(" main x = " + x);<br />21. }<br />22.<br />23. void doStuff(int x) {<br />24. System.out.print(" doStuff x = " + x++);<br />25. }<br />26. }<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. doStuff x = 6 main x = 6<br />D. doStuff x = 6 main x = 7<br />E. doStuff x = 7 main x = 6<br />F. doStuff x = 7 main x = 7 <br /> <br /> Answer: B<br />Q: 03 Given:<br />13. public class Pass {<br />14. public static void main(String [] args) {<br />15. int x = 5;<br />16. Pass p = new Pass();<br />17. p.doStuff(x);<br />18. System.out.print(" main x = " + x);<br />19. }<br />20.<br />21. void doStuff(int x) {<br />22. System.out.print(" doStuff x = " + x++);<br />23. }<br />24. }<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. doStuff x = 6 main x = 6<br />D. doStuff x = 5 main x = 5<br />E. doStuff x = 5 main x = 6<br />F. doStuff x = 6 main x = 5<br />Answer: D<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-715477715930060474?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/LGCpccQytAqT0Ox02Ca8rgGbwNc/0/da"><img src="http://feedads.g.doubleclick.net/~a/LGCpccQytAqT0Ox02Ca8rgGbwNc/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/LGCpccQytAqT0Ox02Ca8rgGbwNc/1/da"><img src="http://feedads.g.doubleclick.net/~a/LGCpccQytAqT0Ox02Ca8rgGbwNc/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/Jl4taNPKiLg" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-in-scjp-exam.htmltag:blogger.com,1999:blog-8247527494114144048.post-29790318075610405332010-01-29T05:57:00.000-08:002010-01-29T06:33:02.560-08:002010-01-29T06:33:02.560-08:00<br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><br />Q: 01 Given:<br />11. public class Test {<br />12. public static void main(String [] args) {<br />13. int x = 5;<br />14. boolean b1 = true;<br />15. boolean b2 = false;<br />16.<br />17. if ((x == 4) && !b2 )<br />18. System.out.print("1 ");<br />19. System.out.print("2 ");<br />20. if ((b2 = true) && b1 )<br />21. System.out.print("3 ");<br />22. }<br />23. } <br />What is the result?<br />A. 2<br />B. 3<br />C. 1 2<br />D. 2 3<br />E. 1 2 3<br />F. Compilation fails.<br />G. An exception is thrown at runtime.<br />Answer: D<br />Q: 02 Given the command line java Pass2 and:<br />15. public class Pass2 {<br />16. public void main(String [] args) {<br />17. int x = 6;<br />18. Pass2 p = new Pass2();<br />19. p.doStuff(x);<br />20. System.out.print(" main x = " + x);<br />21. }<br />22.<br />23. void doStuff(int x) {<br />24. System.out.print(" doStuff x = " + x++);<br />25. }<br />26. }<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. doStuff x = 6 main x = 6<br />D. doStuff x = 6 main x = 7<br />E. doStuff x = 7 main x = 6<br />F. doStuff x = 7 main x = 7 <br /> <br /> Answer: B<br />Q: 03 Given:<br />13. public class Pass {<br />14. public static void main(String [] args) {<br />15. int x = 5;<br />16. Pass p = new Pass();<br />17. p.doStuff(x);<br />18. System.out.print(" main x = " + x);<br />19. }<br />20.<br />21. void doStuff(int x) {<br />22. System.out.print(" doStuff x = " + x++);<br />23. }<br />24. }<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. doStuff x = 6 main x = 6<br />D. doStuff x = 5 main x = 5<br />E. doStuff x = 5 main x = 6<br />F. doStuff x = 6 main x = 5<br />Answer: D<br />Question: 04<br />Given:<br />42. public class ClassA {<br />43. public int getValue() {<br />44.int value=0;<br />45. boolean setting = true;<br />46. String title=”Hello”;<br />47. if (value || (setting && title == “Hello”)) { return 1; }<br />48. if (value == 1 & title.equals(”Hello”)) { return 2; }<br />49. }<br />50. }<br />And:<br />70. ClassA a = new ClassA();<br />71. a.getValue();<br />What is the result?<br />A. 1<br />B. 2<br />C. Compilation fails.<br />D. The code runs with no output.<br />E. An exception is thrown at runtime.<br />Answer: C<br />5. Given:<br />class Hexy {<br />public static void main(String[] args) {<br />Integer i = 42;<br />String s = (i<40)?"life":(i>50)?"universe":"everything";<br />System.out.println(s);<br />} }<br />What is the result?<br />A. null<br />B. life<br />C. universe<br />D. everything<br />E. Compilation fails.<br />F. An exception is thrown at runtime.<br />Answer:<br />-> D is correct. This is a ternary nested in a ternary with a little unboxing thrown in.<br />Both of the ternary expressions are false.<br />-> A, B, C, E, and F are incorrect based on the above.<br /><br/><center><a href="http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-scjp-questions-on-operators.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/frequently-asked-questions-on-operators.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7603.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_5249.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-questions-in-scjp-material.html">7</a> --> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Main page</a></center><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-2979031807561040533?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/T79_5bZdMKLWetMsnA-8yh_cHTI/0/da"><img src="http://feedads.g.doubleclick.net/~a/T79_5bZdMKLWetMsnA-8yh_cHTI/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/T79_5bZdMKLWetMsnA-8yh_cHTI/1/da"><img src="http://feedads.g.doubleclick.net/~a/T79_5bZdMKLWetMsnA-8yh_cHTI/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/MeNUPuvH0w8" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-exam-quesions-on-operators.htmltag:blogger.com,1999:blog-8247527494114144048.post-45780924106178960262010-01-29T05:31:00.000-08:002010-01-29T05:37:31.726-08:002010-01-29T05:37:31.726-08:00<center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> </center><br/><br/><center><br /><a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br />28. Given:<br />1. enum Animals {<br />2. DOG("woof"), CAT("meow"), FISH("burble");<br />3. String sound;<br />4. Animals(String s) { sound = s; }<br />5. }<br />6. class TestEnum {<br />7. static Animals a;<br />8. public static void main(String [] args) {<br />9. System.out.println(a.DOG.sound + " " + a.FISH.sound);<br />10. }<br />11. }<br />What is the result?<br />A. woof burble<br />B. Multiple compilation errors<br />C. Compilation fails due to an error on line 2<br />D. Compilation fails due to an error on line 3<br />E. Compilation fails due to an error on line 4<br />F. Compilation fails due to an error on line 9<br />Answer:<br />-> A is correct; enums can have constructors and variables.<br />->B, C, D, E, and F are incorrect; these lines all use correct syntax.<br />29. Given:<br />1. enum A { A }<br />2. class E2 {<br />3. enum B { B }<br />4. void C() {<br />5. enum D { D }<br />6. }<br />7. }<br />Which statements are true? (Choose all that apply.)<br />A. The code compiles.<br />B. If only line 1 is removed the code compiles.<br />C. If only line 3 is removed the code compiles.<br />D. If only line 5 is removed the code compiles.<br />E. If lines 1 and 3 are removed the code compiles.<br />F. If lines 1, 3 and 5 are removed the code compiles.<br />Answer<br />->D and F are correct. Line 5 is the only line that will not compile, because enums cannot belocal to a method.<br />->A, B, C and E are incorrect based on the above.<br/><br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> </center><br/><br/><center><br /><a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-4578092410617896026?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/rWa-xoIZkgnS-6ZT0dJk456972o/0/da"><img src="http://feedads.g.doubleclick.net/~a/rWa-xoIZkgnS-6ZT0dJk456972o/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/rWa-xoIZkgnS-6ZT0dJk456972o/1/da"><img src="http://feedads.g.doubleclick.net/~a/rWa-xoIZkgnS-6ZT0dJk456972o/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/gB8ud-Sgt8o" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.htmltag:blogger.com,1999:blog-8247527494114144048.post-82724987858728555402010-01-29T05:30:00.000-08:002010-01-29T05:38:53.487-08:002010-01-29T05:38:53.487-08:00<br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><br />Q: 23 Given:<br />1. package sun.scjp;<br />2. public enum Color { RED, GREEN, BLUE }<br />1. package sun.beta;<br />2. // insert code here<br />3. public class Beta {<br />4. Color g = GREEN;<br />5. public static void main( String[] argv)<br />6. { System.out.println( GREEN); }<br />7. }<br />The class Beta and the enum Color are in different packages.<br />Which two code fragments, inserted individually at line 2 of the Beta<br />declaration, will allow this code to compile? (Choose two.)<br />A. import sun.scjp.Color.*;<br />B. import static sun.scjp.Color.*;<br />C. import sun.scjp.Color; import static sun.scjp.Color.*;<br />D. import sun.scjp.*; import static sun.scjp.Color.*;<br />E. import sun.scjp.Color; import static sun.scjp.Color.GREEN;<br />Answer: CE<br />Question 24<br />Given:<br />10. public class Fabric<br />11. public enum Color {<br />12. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff);<br />13. private final int rgb;<br />14. Color( int rgb) { this.rgb = rgb; }<br />15. public int getRGB() { return rgb; }<br />16. };<br />17. public static void main( String[] argv) {<br />18. // insert code here<br />19. }<br />20. }<br />Which two code fragments, inserted independently at line 18, allow the<br />Fabric class to compile? (Choose two.)<br />A. Color skyColor = BLUE;<br />B. Color treeColor = Color.GREEN;<br />C. Color purple = new Color( 0xff00ff);<br />D. if( RED.getRGB() < BLUE.getRGB() ) {}<br />E. Color purple = Color.BLUE + Color.RED;<br />F. if( Color.RED.ordinal() < Color.BLUE.ordinal() ) {}<br />Answer: BF<br />25. Given the following,<br />1. interface Base {<br />2. boolean m1 ();<br />3. byte m2(short s);<br />4. }<br />Which code fragments will compile? (Choose all that apply.)<br />A. interface Base2 implements Base { }<br />B. abstract class Class2 extends Base {<br />public boolean m1() { return true; } }<br />C. abstract class Class2 implements Base { }<br />D. abstract class Class2 implements Base {<br />public boolean m1() { return (true); } }<br />E. class Class2 implements Base {<br />boolean m1() { return false; }<br />byte m2(short s) { return 42; } }<br />Answer:<br />-> C and D are correct. C is correct because an abstract class doesn't have to implement any or all of its interface's methods. D is correct because the method is correctly implemented.<br />-> A is incorrect because interfaces don't implement anything. B is incorrect because classes don't extend interfaces. E is incorrect because interface methods are implicitly public, so the methods being implemented must be public.<br /> 26. Which declare a compilable abstract class? (Choose all that apply.)<br />A. public abstract class Canine { public Bark speak(); }<br />B. public abstract class Canine { public Bark speak() { } }<br />C. public class Canine { public abstract Bark speak(); }<br />D. public class Canine abstract { public abstract Bark speak(); }<br />Answer:<br />->B is correct. abstract classes don't have to have any abstract methods.<br />-> A is incorrect because abstract methods must be marked as such. C is incorrect becauseyou can't have an abstract method unless the class is abstract. D is incorrect because thekeyword abstract must come before the classname. (Objective 1.1)<br />27. Which is true? (Choose all that apply.)<br />A. "X extends Y" is correct if and only if X is a class and Y is an interface.<br />B. "X extends Y" is correct if and only if X is an interface and Y is a class.<br />C. "X extends Y" is correct if X and Y are either both classes or both interfaces.<br />D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.<br />Answer:<br />-> C is correct.<br />-> A is incorrect because classes implement interfaces, they don't extend them.<br /> B is incorrect because interfaces only "inherit from" other interfaces.<br /> D is incorrect based on the preceding rules.<br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-8272498785872855540?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/EPnS_5n9uymTx9P6TG7Bl9Vlc9Y/0/da"><img src="http://feedads.g.doubleclick.net/~a/EPnS_5n9uymTx9P6TG7Bl9Vlc9Y/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/EPnS_5n9uymTx9P6TG7Bl9Vlc9Y/1/da"><img src="http://feedads.g.doubleclick.net/~a/EPnS_5n9uymTx9P6TG7Bl9Vlc9Y/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/FP_8z1t0lvs" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.htmltag:blogger.com,1999:blog-8247527494114144048.post-79583022825900700812010-01-29T05:28:00.000-08:002010-01-29T05:39:27.393-08:002010-01-29T05:39:27.393-08:00<br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><br />Q: 17 Click the Task button.<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp5.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp5.jpg" border="0" height=300 width=300 alt="Photobucket"></a><br />Solution:<br />package alpha;<br />public class Alpha{<br />private String alpha;<br />public Alpha( ){ this("A") ; }<br />protected Alpha(String a){ alpha=a; }<br />}<br />package beta;<br />public class Beta extends alpha.Alpha{<br />private Beta(String a){ super(a); }<br />}<br />Q: 18 Given:<br />1. public class Target {<br />2. private int i = 0;<br />3. public int addOne(){<br />4. return ++i;<br />5. }<br />6. }<br />And:<br />1. public class Client {<br />2. public static void main(String[] args){<br />3. System.out.println(new Target().addOne());<br />4. }<br />5. }<br />Which change can you make to Target without affecting Client?<br />A. Line 4 of class Target can be changed to return i++;<br />B. Line 2 of class Target can be changed to private int i = 1;<br />C. Line 3 of class Target can be changed to private int addOne(){<br />D. Line 2 of class Target can be changed to private Integer i = 0;<br />Answer: D<br />Q: 19 Click the Task button.<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp6.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp6.jpg" border="0" alt="Photobucket"></a><br />Solution:<br />public class Single{<br /> private static Single instance;<br /> public static Single getInstance( ){<br /> if(instance==null) instance = create( );<br /> return instance;<br /> }<br />protectedSingle( ) { }<br />staticSingle create ( ) { return new Single ( ) ; }<br />}<br />class SingleSub extends Shape{<br /> }<br />Q: 20 Given:<br />12. public class Test {<br />13. public enum Dogs {collie, harrier};<br />14. public static void main(String [] args) {<br />15. Dogs myDog = Dogs.collie;<br />16. switch (myDog) {<br />17. case collie:<br />18. System.out.print("collie ");<br />19. case harrier:<br />20. System.out.print("harrier ");<br />21. }<br />22. }<br />23. }<br />What is the result?<br />A. collie B. harrier<br />C. Compilation fails. D. collie harrier<br />E. An exception is thrown at runtime.<br />Answer: D<br />Q: 21 Click the Exhibit button.<br />Given: <br />ClassA a = new ClassA();<br />a.methodA();<br />What is the result?<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp7.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp7.jpg" border="0" alt="Photobucket"></a><br /> <br />A. Compilation fails.<br />B. ClassC is displayed.<br />C. The code runs with no output.<br />D. An exception is thrown at runtime.<br />Answer: D<br />Q: 22 Click the Task button.<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp8.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp8.jpg" border="0" alt="Photobucket"></a><br />Solution:<br />public int update(int quantity,int adjust){<br />quantity=quantity+adjust;<br />return quantity;<br />}<br />public void call Update( ) {<br />int quant=100;<br />quant=update(quant,320);<br />System.out.println("the quantity is " +quant);<br />}<br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-7958302282590070081?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/CfVtA-WEWi1dB3VpkdtND7F0s9k/0/da"><img src="http://feedads.g.doubleclick.net/~a/CfVtA-WEWi1dB3VpkdtND7F0s9k/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/CfVtA-WEWi1dB3VpkdtND7F0s9k/1/da"><img src="http://feedads.g.doubleclick.net/~a/CfVtA-WEWi1dB3VpkdtND7F0s9k/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/Xz6ZxXycE9g" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.htmltag:blogger.com,1999:blog-8247527494114144048.post-14228344045573657632010-01-29T05:26:00.000-08:002010-01-29T05:39:58.539-08:002010-01-29T05:39:58.539-08:00<br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><br />Q: 6 Given:<br />11. class Cup { }<br />12. class PoisonCup extends Cup { }<br />...<br />21. public void takeCup(Cup c) {<br />22. if (c instanceof PoisonCup) {<br />23. System.out.println("Inconceivable!");<br />24. } else if (c instanceof Cup) {<br />25. System.out.println("Dizzying intellect!");<br />26. } else {<br />27. System.exit(0);<br />28. }<br />29. }<br />And the execution of the statements:<br />Cup cup = new PoisonCup();<br />takeCup(cup);<br />What is the output?<br />A. Inconceivable!<br />B. Dizzying intellect!<br />C. The code runs with no output.<br />D. An exception is thrown at runtime.<br />E. Compilation fails because of an error in line 22.<br />Answer: A<br />Q: 7 Click the Exhibit button.<br />public class A<br />{<br /> private int counter=0;<br /> public static int getInstanceCount()<br /> {<br /> return counter;<br /> }<br /> public A()<br /> {<br /> counter++;<br /> }<br /> }<br />Given this code from Class B:<br />25. A a1 = new A();<br />26. A a2 = new A();<br />27. A a3 = new A();<br />28. System.out.println(A.getInstanceCount());<br />What is the result?<br />A. Compilation of class A fails.<br />B. Line 28 prints the value 3 to System.out.<br />C. Line 28 prints the value 1 to System.out.<br />D. A runtime error occurs when line 25 executes.<br />E. Compilation fails because of an error on line 28.<br />Answer: A<br />Q:8 Given:<br />11. String[] elements = { "for", "tea", "too" };<br />12. String first = (elements.length > 0) ? elements[0] : null;<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. The variable first is set to null.<br />D. The variable first is set to elements[0].<br />Answer: D<br />Q:09 Given:<br />11. interface DeclareStuff {<br />12. public static final int EASY = 3;<br />13. void doStuff(int t); }<br />14. public class TestDeclare implements DeclareStuff {<br />15. public static void main(String [] args) {<br />16. int x = 5;<br />17. new TestDeclare().doStuff(++x);<br />18. }<br />19. void doStuff(int s) {<br />20. s += EASY + ++s;<br />21. System.out.println("s " + s);<br />22. }<br />23. }<br />What is the result?<br />A. s 14<br />B. s 16<br />C. s 10<br />D. Compilation fails.<br />E. An exception is thrown at runtime.<br />Answer: D<br /><br />Q: 10 Given:<br />1. public class TestString1 {<br />2. public static void main(String[] args) {<br />3. String str = "420";<br />4. str += 42;<br />5. System.out.print(str);<br />6. }<br />7. }<br />What is the output?<br />A. 42<br />B. 420<br />C. 462<br />D. 42042<br />E. Compilation fails.<br />F. An exception is thrown at runtime.<br />Answer: D<br />Q: 11 Given:<br />11. class Converter {<br />12. public static void main(String[] args) {<br />13. Integer i = args[0];<br />14. int j = 12;<br />15. System.out.println("It is " + (j==i) + " that j==i.");<br />16. }<br />17. }<br />What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?<br />A. It is true that j==i.<br />B. It is false that j==i.<br />C. An exception is thrown at runtime.<br />D. Compilation fails because of an error in line 13.<br />Answer: D<br />Q: 12 Given:<br />10. int x = 0;<br />11. int y = 10;<br />12. do {<br />13. y--;<br />14. ++x;<br />15. } while (x < 5);<br />16. System.out.print(x + "," + y);<br />What is the result?<br />A. 5,6<br />B. 5,5<br />C. 6,5<br />D. 6,6<br />Answer: B<br />Q: 13 Given:<br />1. public interface A {<br />2. String DEFAULT_GREETING = "Hello World";<br />3. public void method1();<br />4. }<br />A programmer wants to create an interface called B that has A as its parent. Which interface declaration is correct?<br />A. public interface B extends A {}<br />B. public interface B implements A {}<br />C. public interface B instanceOf A {}<br />D. public interface B inheritsFrom A {}<br />Answer: A<br />Q: 14 Given:<br />11. public enum Title {<br />12. MR("Mr."), MRS("Mrs."), MS("Ms.");<br />13. private final String title;<br />14. private Title(String t) { title = t; }<br />15. public String format(String last, String first) {<br />16. return title + " " + first + " " + last;<br />17. }<br />18. }<br />19. public static void main(String[] args) {<br />20. System.out.println(Title.MR.format("Doe", "John"));<br />21. }<br />What is the result?<br />A. Mr. John Doe<br />B. An exception is thrown at runtime.<br />C. Compilation fails because of an error in line 12.<br />D. Compilation fails because of an error in line 15.<br />E. Compilation fails because of an error in line 20.<br />Answer: A<br />Q: 15 Given:<br />1. package test;<br />2.<br />3. class Target {<br />4. public String name = "hello";<br />5. }<br />What can directly access and change the value of the variable name?<br />A. any class B. only the Target class<br />C. any class in the test package D. any class that extends Target<br />Answer: C<br />Q: 16 Given:<br />11. public class Ball{<br />12. public enum Color { RED, GREEN, BLUE };<br />13. public void foo(){<br />14. // insert code here<br />15. { System.out.println(c); }<br />16. }<br />17. }<br />Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE?<br />A. for( Color c : Color.values() )<br />B. for( Color c = RED; c <= BLUE; c++ )<br />C. for( Color c ; c.hasNext() ; c.next() )<br />D. for( Color c = Color[0]; c <= Color[2]; c++ )<br />E. for( Color c = Color.RED; c <= Color.BLUE; c++ )<br />Answer: A<br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-1422834404557365763?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/9wVoFJy7DCaiovDWrWmh43h5FJ0/0/da"><img src="http://feedads.g.doubleclick.net/~a/9wVoFJy7DCaiovDWrWmh43h5FJ0/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/9wVoFJy7DCaiovDWrWmh43h5FJ0/1/da"><img src="http://feedads.g.doubleclick.net/~a/9wVoFJy7DCaiovDWrWmh43h5FJ0/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/1ZQVCgnvIHQ" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.htmltag:blogger.com,1999:blog-8247527494114144048.post-13656718705313020772010-01-29T05:25:00.000-08:002010-01-29T05:40:24.593-08:002010-01-29T05:40:24.593-08:00<br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><br />Q: 5 Given classes defined in two different files:<br />1. package util;<br />2. public class BitUtils {<br />3. private static void process(byte[] b) {}<br />4. }<br />1. package app;<br />2. public class SomeApp {<br />3. public static void main(String[] args) {<br />4. byte[] bytes = new byte[256];<br />5. // insert code here<br />6. }<br />7. }<br />What is required at line 5 in class SomeApp to use the process method of BitUtils?<br />A. process(bytes);<br />B. BitUtils.process(bytes);<br />C. app.BitUtils.process(bytes);<br />D. util.BitUtils.process(bytes);<br />E. import util.BitUtils.*; process(bytes);<br />F. SomeApp cannot use the process method in BitUtils.<br />Answer: F<br />Q: 6 Given:<br />11. class Cup { }<br />12. class PoisonCup extends Cup { }<br />...<br />21. public void takeCup(Cup c) {<br />22. if (c instanceof PoisonCup) {<br />23. System.out.println("Inconceivable!");<br />24. } else if (c instanceof Cup) {<br />25. System.out.println("Dizzying intellect!");<br />26. } else {<br />27. System.exit(0);<br />28. }<br />29. }<br />And the execution of the statements:<br />Cup cup = new PoisonCup();<br />takeCup(cup);<br />What is the output?<br />A. Inconceivable!<br />B. Dizzying intellect!<br />C. The code runs with no output.<br />D. An exception is thrown at runtime.<br />E. Compilation fails because of an error in line 22.<br />Answer: A<br />Q: 7 Click the Exhibit button.<br />public class A<br />{<br /> private int counter=0;<br /> public static int getInstanceCount()<br /> {<br /> return counter;<br /> }<br /> public A()<br /> {<br /> counter++;<br /> }<br /> }<br />Given this code from Class B:<br />25. A a1 = new A();<br />26. A a2 = new A();<br />27. A a3 = new A();<br />28. System.out.println(A.getInstanceCount());<br />What is the result?<br />A. Compilation of class A fails.<br />B. Line 28 prints the value 3 to System.out.<br />C. Line 28 prints the value 1 to System.out.<br />D. A runtime error occurs when line 25 executes.<br />E. Compilation fails because of an error on line 28.<br />Answer: A<br />Q:8 Given:<br />11. String[] elements = { "for", "tea", "too" };<br />12. String first = (elements.length > 0) ? elements[0] : null;<br />What is the result?<br />A. Compilation fails.<br />B. An exception is thrown at runtime.<br />C. The variable first is set to null.<br />D. The variable first is set to elements[0].<br />Answer: D<br />Q:09 Given:<br />11. interface DeclareStuff {<br />12. public static final int EASY = 3;<br />13. void doStuff(int t); }<br />14. public class TestDeclare implements DeclareStuff {<br />15. public static void main(String [] args) {<br />16. int x = 5;<br />17. new TestDeclare().doStuff(++x);<br />18. }<br />19. void doStuff(int s) {<br />20. s += EASY + ++s;<br />21. System.out.println("s " + s);<br />22. }<br />23. }<br />What is the result?<br />A. s 14<br />B. s 16<br />C. s 10<br />D. Compilation fails.<br />E. An exception is thrown at runtime.<br />Answer: D<br /><br />Q: 10 Given:<br />1. public class TestString1 {<br />2. public static void main(String[] args) {<br />3. String str = "420";<br />4. str += 42;<br />5. System.out.print(str);<br />6. }<br />7. }<br />What is the output?<br />A. 42<br />B. 420<br />C. 462<br />D. 42042<br />E. Compilation fails.<br />F. An exception is thrown at runtime.<br />Answer: D<br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-1365671870531302077?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/EAZWxk4Hj7Fm1PQfELSj6CUf9fA/0/da"><img src="http://feedads.g.doubleclick.net/~a/EAZWxk4Hj7Fm1PQfELSj6CUf9fA/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/EAZWxk4Hj7Fm1PQfELSj6CUf9fA/1/da"><img src="http://feedads.g.doubleclick.net/~a/EAZWxk4Hj7Fm1PQfELSj6CUf9fA/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/8zpPE1UBDOg" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-material_29.htmltag:blogger.com,1999:blog-8247527494114144048.post-76300269270948095182010-01-29T05:21:00.000-08:002010-01-29T05:40:59.299-08:002010-01-29T05:40:59.299-08:00<br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><br />Q: 1 Click the Task button.<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp3.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp3.jpg" border="0" alt="Photobucket"></a><br /><br />Solution:<br />enum Element{<br /> EARTH,WIND,<br /> FIRE{public String info(){return "Hot";}<br /> };<br /> public String info(){return "element";}<br />}<br />Q: 2 Given:<br />10. package com.sun.scjp;<br />11. public class Geodetics {<br />12. public static final double DIAMETER = 12756.32; // kilometers<br />13. }<br />Which two correctly access the DIAMETER member of the Geodetics class? (Choose two.)<br />A. import com.sun.scjp.Geodetics;<br />public class TerraCarta {<br />public double halfway()<br />{ return Geodetics.DIAMETER/2.0; }<br />B. import static com.sun.scjp.Geodetics;<br />public class TerraCarta{<br />public double halfway() { return DIAMETER/2.0; } }<br />C. import static com.sun.scjp.Geodetics.*;<br />public class TerraCarta {<br />public double halfway() { return DIAMETER/2.0; } }<br />D. package com.sun.scjp;<br />public class TerraCarta {<br />public double halfway() { return DIAMETER/2.0; } }<br />Answer: A, C<br /><br />Q: 3 Click the Task button.<br /><a href="http://s761.photobucket.com/albums/xx252/daneshus/?action=view&current=scjp4.jpg" target="_blank"><img src="http://i761.photobucket.com/albums/xx252/daneshus/scjp4.jpg" border="0" alt="Photobucket"></a><br />Solution:<br />package com.sun.cert;<br />import java.util.*;<br />public class AddressBook{<br /> ArrayList entries;<br />}<br />Q: 4 Which two classes correctly implement both the java.lang.Runnable and the<br />java.lang.Clonable interfaces? (Choose<br />A. public class Session<br />implements Runnable, Clonable {<br />public void run();<br />public Object clone();<br />}<br />B. public class Session<br />extends Runnable, Clonable {<br />public void run() { /* do something */ }<br />public Object clone() { /* make a copy */ }<br />C. public class Session<br />implements Runnable, Clonable {<br />public void run() { /* do something */ }<br />public Object clone() { /* make a copy */ }<br />D. public abstract class Session<br />implements Runnable, Clonable {<br />public void run() { /* do something */ }<br />public Object clone() { /*make a copy */ }<br />E. public class Session<br />implements Runnable, implements Clonable {<br />public void run() { /* do something */ }<br />public Object clone() { /* make a copy */ }<br />Answer: C, D<br /><br/><center> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html">1</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_29.html">2</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material_7493.html">3</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material-and-questions.html">4</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-frequently-asked-questions-and.html">5</a> <a href="http://easyinterviews.blogspot.com/2010/01/repeated-q-in-scjp-exam.html">6</a> <a href="http://easyinterviews.blogspot.com/2010/01/scjp-material.html">Goto main page</a></center><br/><br/><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8247527494114144048-7630026927094809518?l=easyinterviews.blogspot.com' alt='' /></div> <p><a href="http://feedads.g.doubleclick.net/~a/gckIhNTNpcrM8NrTEA71_SrAz8w/0/da"><img src="http://feedads.g.doubleclick.net/~a/gckIhNTNpcrM8NrTEA71_SrAz8w/0/di" border="0" ismap="true"></img></a><br/> <a href="http://feedads.g.doubleclick.net/~a/gckIhNTNpcrM8NrTEA71_SrAz8w/1/da"><img src="http://feedads.g.doubleclick.net/~a/gckIhNTNpcrM8NrTEA71_SrAz8w/1/di" border="0" ismap="true"></img></a></p><img src="http://feeds.feedburner.com/~r/blogspot/MVpJ/~4/jO7yyHt3NuA" height="1" width="1"/>interviewquestionshttp://www.blogger.com/profile/04802101131422225363noreply@blogger.com0http://easyinterviews.blogspot.com/2010/01/scjp-quesions-on-declarations-and.html