Anonymous class

[ravian]

I am interested in using anonymous classes. I read somewhere that anonymous classes should be preferred when class have a very short body an only one instance of that class is needed.

Can some one guide me about the syntax and working of anonymous classes.

Thanks in advance.

[khamuruddeen]

I think its useful 2 u

Anonymous Classes in Java

[hardwired]

More (pseudo code) examples:

Code:

JButton button = new JButton("say something");
button.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        System.out.println("something");
    }
});
SpinnerNumberModel model = new SpinnerNumberModel(10,0,100,1);
JSpinner spinner = new JSpinner(model);
spinner.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent e) {
        int value = ((Integer)((JSpinner)e.getSource()).getValue()).intValue();
        tellSomeone(value);
    }
});
// Although not an anonymous listener in the strict
// sense, this approach can make sense sometimes:
JButton someButton = new JButton("compute");
final JTextField textField = new JTextField(12);
ActionListener al = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        int n = Integer.parseInt(textField.getText());
        doSomething(n);
    }
};
someButton.addActionListener(al);
textField.addActionListener(al);

[ravian]

Thanks for the details.
I will try this out.