Java Reference
In-Depth Information
import java.awt.*;
import javax.swing.*;
public class ButtonDemo extends JFrame
{
private JButton red, blue, white;
public ButtonDemo(String title)
{
super(title);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
red = new JButton(“Red”);
blue = new JButton(“Blue”);
white = new JButton(“White”);
//add the buttons to the frame
JPanel south = new JPanel();
south.add(red);
south.add(blue);
south.add(white);
Container contentPane = this.getContentPane();
contentPane.add(south, BorderLayout.SOUTH);
//register the event listener
ColorChanger changer = new ColorChanger(this);
red.addActionListener(changer);
blue.addActionListener(changer);
white.addActionListener(changer);
}
public static void main(String [] args)
{
JFrame f = new ButtonDemo(“ButtonDemo”);
f.setSize(300,300);
f.setVisible(true);
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class ColorChanger implements ActionListener
{
private Container container;
public ColorChanger(JFrame c)
{
container = c.getContentPane();
}
public void actionPerformed(ActionEvent a)
{
