1. Loop through the list and for each slot
   1. Compare current value with the given value
   2. If match is found modify current item and break the loop
2. If the given value wasn’t find in the loop add it to the list

Turns out breaking out of loops using labels also works for curly block of code so the solution is below

List list = getFromSomewhere();
Foo foo = whatever();
gotu: {
    for (Foo f : list) {
        if ( f.equals(foo)) {
            f.setBlah(foo.getBlah()); // blah is not used in compare()
            break gotu;
       }
    }
// only want to execute the following if the loop was never broken
list.add(foo);
}

• Open any of buzz messages in your Inbox

• Pick “Filter messages like this” from “More Actions” button/link on top-right portion of message window
• The form will open. Type “Buzz from” including quotes into Subject field. Or you can use label:buzz
• Click “Test Search” you should see your buzz messages only
• Click “Next Step”
• Put check-mark into “Skip Inbox”
• Optionally you can assign label to this filter. You won’t be able to pick “buzz” but you can use something like “whadabuzz” or anything else
• Optionally select “Also apply filter to N conversations below”.
• Click “Create Filter”.
• Return to Inbox. Buzz messages should be gone