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This is a Java trick which involves creating an anonymous class with an initialiser block, eg. [code=java] new Object() {{ // Initialisation stuff here }}; [/code] It's especially useful for collections: [code=java] List<Integer> list = new ArrayList<Integer>() {{ add(1); add(2); add(3); add(4); add(5); }}; System.out.println(list); [/code] [code=java] Map<Integer, String> map = new HashMap<Integer, String>() {{ put(1, "one"); put(2, "two"); put(3, "three"); put(4, "four"); put(5, "five"); }}; System.out.println(map); [/code] But can also be useful in GUI programming: [code=java] JFrame frame = new JFrame() {{ setDefaultCloseOperation(EXIT_ON_CLOSE); add(new JLabel("Hello, World!")); pack(); }}; frame.setVisible(true); [/code] Be careful when using this, however, because any object created using double brace initialisation belongs to an anonymous subclass, not the original class.
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