actionListener question

A demo:

import javax.swing.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

class Test extends JFrame {

private int i;

private JButton button;

private JButton button2;

public Test() {

initComponents();

}

private void initComponents() {

i = 0;

button = new JButton("Increment I");

button2 = new JButton("Show Value");

button.setSize(100, 20);

button2.setSize(100, 20);

button.setLocation(5, 5);

button2.setLocation(5, 30);

this.getContentPane().setLayout(null);

this.getContentPane().add(button);

this.getContentPane().add(button2);

this.pack();

this.setSize(300, 300);

this.setLocationRelativeTo(null);

this.setTitle("Demo");

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

button.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

i++;

}

});

button2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

System.out.println("i = " + i);

}

});

}

public static void main(String[] argv) {

new Test().setVisible(true);

}

}

Navy_Codera at 2007-7-12 22:15:01 >