APCS Java

Comparator Interface in Gridworld

noreply@blogger.com (Chris Thiel) — Wed, 23 Nov 2011 16:00:45 PST

Here is a customized World for Gridworld where the message on the top is updated to show how many bugs there are and the location of the furthest Bug in the grid. You need to implement the Comparator interface for the grid world Bug class. You need to define a compare method that returns an int. Get the location of each Bug and use the compareTo method of Location. Here is the starter code: apcs.mathorama.com

One To Ten Game Part 3

noreply@blogger.com (Chris Thiel) — Sun, 23 Oct 2011 17:50:14 PDT

Part 3 of the One to Ten Game which explains the Player Class. You can see a working copy at http://www.mathorama.com/OneToTenConsole.html

One to Ten Game Part 2

noreply@blogger.com (Chris Thiel) — Sat, 22 Oct 2011 23:49:37 PDT

Part 2 of 3 of the One to Ten Game

One to Ten Game Part 1

noreply@blogger.com (Chris Thiel) — Sat, 22 Oct 2011 17:29:28 PDT

In this tutorial, we make a game called "1 to 10" rather than tic-tac-toe (naughts and crosses). We will construct A Board Class in the first part along with a tester class. The idea is to move a page either one or two positions, and the one in the last position loses. The strategy is not to difficult, so eventually we can make a robot player who will always play perfectly.

Make a Java Class for Dots

noreply@blogger.com (Chris Thiel) — Sat, 03 Sep 2011 17:28:53 PDT

Make a new object that represents a dot using the eclipse IDE.

Making a JAR file in Eclipse

noreply@blogger.com (Chris Thiel) — Mon, 23 May 2011 00:45:41 PDT

If you want to publish your Applet to the web, you probably need to make a Java Archive, or JAR file that allows you to embed your Applet in a web page

Bug Demo:Circle Bug with Eclipse

noreply@blogger.com (Chris Thiel) — Mon, 14 Mar 2011 15:47:32 PDT

Use Eclipse to make a Circle Bug

Getting Started with APCS Java on Windows 7

noreply@blogger.com (Chris Thiel) — Sun, 22 Aug 2010 17:24:56 PDT

How to get what you need installed on your Windows 7 machine

Starting APCS with linux

noreply@blogger.com (Chris Thiel) — Sat, 21 Aug 2010 10:24:48 PDT

PokerHand

noreply@blogger.com (Chris Thiel) — Sat, 28 Nov 2009 14:07:15 PST

To make a variety of Poker games, we need a way to evaluate and compare Poker hands. This video also shows how to implement an interface in an inner class, so that a user can press a button, and new poker hands are generated. Starter code can be found at the APCS Wiki.

Interfaces Part 3

noreply@blogger.com (Chris Thiel) — Mon, 21 Feb 2011 15:07:27 PST

Implementing java interfaces for any Object. For "starter" code see the APCS Wiki

Java Interfaces Parts 1 and 2

noreply@blogger.com (Chris Thiel) — Mon, 21 Feb 2011 15:04:58 PST

We introduce a way to use code to work with a variety of classes using interfaces. Source code can be found at the APCS Wiki

Making Classes with the Eclipse IDE

noreply@blogger.com (Chris Thiel) — Mon, 07 Sep 2009 14:57:50 PDT

Make mew Projects and Classes in Eclipse.

Dr Java interactions

noreply@blogger.com (Chris Thiel) — Sat, 22 Aug 2009 20:31:15 PDT

Click on the title to see the video. Here I show how to try the code snippets that you will see while reading Chapter 2 of Horstmann, "Java Concepts"

Cryptography

noreply@blogger.com (Chris Thiel) — Fri, 14 May 2010 16:35:00 PDT

Starting Code:


import java.util.Scanner;
/**
 * Simple Polyalphabetic Cryptography
 * 
 * @Chris Thiel 
 * @28 Feb 2009
 */
public class VignereCipherStartingCode
{
    private static final String alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private static int nextChar(String k, int i){
        i=i%k.length();
        String letter=k.substring(i,i+1);
        return alphabet.indexOf(letter);
    }
    public static String encode (String m, String k){
        String result="";
        for (int i=0; i<m.length(); i++){
            int offset=nextChar(k, i);
            String letter = m.substring(i,i+1);
            int newLetterIndex= alphabet.indexOf(letter)+offset;
            newLetterIndex=newLetterIndex % 26;
            result+=alphabet.substring( newLetterIndex, newLetterIndex+1);
        }
        return result;
    }
    public static String decode (String m, String k){
        String result="";   
        return result;
    }
    public static void main(String[] args)
    {
        Scanner kb=new Scanner(System.in);
        System.out.print("Type a key: ");
        String key=kb.nextLine();
        key=key.toUpperCase();
        key=key.replace(" ","");//omit spaces
        System.out.print("Type a message: ");
        String message=kb.nextLine();
        message=message.toUpperCase();
        message=message.replace(" ","");
        System.out.println("Using the key \""+key+"\" on \""+message+"\":");
        String codedMessage=encode(message,key);
        System.out.println("Coded="+codedMessage);
        System.out.println("Decoded="+decode(codedMessage,key));
        System.out.println("Using the key 'LOVE' we encode 'BOOHOO' we should get 'MCJLZC' : "+encode("BOOHOO","LOVE"));
        System.out.println("Using the key 'QUICK' we decode 'TOKMXEQ' we should get 'DUCKNOW': "+decode("TOKMXEQ","QUICK"));
  
    }
}

8 points: Complete the decode method so it can decipher the Vignere Cipher
9 points: Adapt this so it can do a Progressive Polyalphabetic Cipher rather than a key
10 points: Adapt the CarTalk Employee Applet's graphic user interface so that you can type a message in one text area, press a button and it shows the encoded text (using the Progressive Cipher), press another button and it shows the decoded text.
11 points: Add a "key field" to the Applet, and use the Vignere Cipher, working in a similiar fashion as the 10 point version

Cheater Catcher Project

noreply@blogger.com (Chris Thiel) — Mon, 19 Jan 2009 20:40:51 PST

Part 2: Organizing the report that shows possible plagiarism might require another data structure to sort. Download the files you need to get started at here. Click the title to see the video.

Cheater Catcher Intro

noreply@blogger.com (Chris Thiel) — Mon, 19 Jan 2009 17:39:57 PST

Overview of how to design a program that checks for patterns of matching words to detect plagiarism.

Base Converter Solution

noreply@blogger.com (Chris Thiel) — Fri, 26 Dec 2008 17:15:41 PST

The solution to the "Base Converter" Lab is discussed

JUnit Testing

noreply@blogger.com (Chris Thiel) — Wed, 24 Dec 2008 21:38:52 PST

Writing code to test the code you want to write! Sounds crazy but it is the quick way to make sure the code does what you want it to!

MasterMind Game

noreply@blogger.com (Chris Thiel) — Wed, 12 Nov 2008 14:38:54 PST

Using Graphic Input, arrays and ArrayLists we create a MasterMind Game Applet

You can get the source code at http://www.stfrank.com/MasterMind/

Subclasses in Java

noreply@blogger.com (Chris Thiel) — Wed, 22 Oct 2008 11:29:21 PDT

See the Forest from the trees!
Organize your objects into superclasses and subclasses

The Code:

Before:


import java.awt.*;
import java.applet.*;
public class UglyForest extends Applet
{
   private int x=200;
   private int y=200;
   public int randomInt(int min, int max)
    {
        //precondition: min<max
        return min+(int)((max-min)*Math.random());
    }
    public void paint(Graphics g)
    {  
      for(int x=50;x<500;x+=120){
        //trunk
        Color brown=new Color(137,66,0);
        g.setColor(brown);
        g.fillRect(x-15,y,30, 30);
       //leaves
       g.setColor(Color.GREEN);
        Polygon leaves= new Polygon();
        for (int i=0;i<100;i++)
            leaves.addPoint(x+randomInt(-1*(80-i),80-i), y-randomInt(i,2*i));
        g.fillPolygon(leaves);
        //lights
        for (int i=0;i<50;i++){
            g.setColor(new Color(randomInt(0,255), 
                                 randomInt(0,255),
                                 randomInt(0,255)
                                 ));
            g.fillOval( x+randomInt(-1*(80-2*i),80-2*i), 
                        y-randomInt(i,4*i),
                        10,10);
        }
      } 
    }
    
}

After:

Forest.java


import java.awt.*;
import java.applet.*;
public class Forest extends Applet
{
    public void paint(Graphics g)
    { 
       Tree myTree1=new Tree(g,200,120);
       Tree myTree2=new Tree(g,120,200);
       ChristmasTree myTree3=new ChristmasTree(g,400,300);
       Tree myTree4=new Tree(g,300,400);  
    }   
}

Tree.java


import java.awt.*;
public class Tree
{
 
 /**
  * Constructor for objects of class Tree
  */
 
 public Tree(Graphics g, int x,int y)
 {
  // initialise instance variables
     drawTrunk(g,x,y);
        drawLeaves(g,x,y);
 }
 public void drawTrunk(Graphics g, int x, int y){
        //trunk
        Color brown=new Color(137,66,0);
        g.setColor(brown);
        g.fillRect(x-15,y,30, 30);
    }
     public void drawLeaves(Graphics g, int x, int y){
        g.setColor(Color.GREEN);
        Polygon leaves= new Polygon();
        for (int i=0;i<100;i++)
            leaves.addPoint(x+randomInt(-1*(80-i),80-i), y-randomInt(i,2*i));
        g.fillPolygon(leaves);
    }
    public int randomInt(int min, int max)
    {
        //precondition: min<max
        return min+(int)((max-min)*Math.random());
    }

}

ChristmasTree.java


import java.awt.*;
public class ChristmasTree extends Tree
{
 
 public ChristmasTree(Graphics g,int x,int y) 
 {
  super(g,x,y);
     drawLights(g,x,y);
  
 }

    public void drawLights(Graphics g, int x, int y){
       
        for (int i=0;i<50;i++){
            g.setColor(new Color(randomInt(0,255), 
                                 randomInt(0,255),
                                 randomInt(0,255)
                                 ));
            g.fillOval( x+randomInt(-1*(80-2*i),80-2*i), 
                        y-randomInt(i,4*i),
                        10,10);
        }
    }

}

Card Class Part 2: Using a Test Class

noreply@blogger.com (Chris Thiel) — Sat, 27 Sep 2008 17:00:23 PDT

Using a test class as you write mew methods to the Card Class

Code is at http://www.stfrank.com/CardLab1_war.html

OOP: A class for Playing Cards Part 1

noreply@blogger.com (Chris Thiel) — Tue, 23 Sep 2008 21:02:33 PDT

A Class to represent an object is explained

Full code and a lab to try at StFrank.com

Eclipse Debugger Demo

noreply@blogger.com (Chris Thiel) — Mon, 22 Sep 2008 01:20:24 PDT

How to use the Eclipse Debugger

BlueJ Debugger

noreply@blogger.com (Chris Thiel) — Sat, 20 Sep 2008 18:46:00 PDT

Use the BlueJ Debugger to find out what is going on!