How are Anonymous inner classes used in Java?

Question

What is the use of anonymous classes in Java? Can we say that usage of anonymous class is one of the advantages of Java?

Answer 1

GuideLines for Anonymous Class.

1. Anonymous class is declared and initialized simultaneously.

2. Anonymous class must extend or implement to one and only one class or interface resp.

3. As anonymouse class has no name, it can be used only once.

eg:

button.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent arg0) {
        // TODO Auto-generated method stub

    }
});