buttondemo.java

java的书上例子

//例13.6	AWT风格绘制的Demo Button
import java.awt.*;
import java.awt.event.*;
import java.awt.Component;
import javax.swing.AbstractButton;

public class ButtonDemo extends Panel
                        implements ActionListener {
    protected Button b1, b2, b3;

    public ButtonDemo() {
       
        b1 = new Button("Press me to Diasable Button2");
        b1.setActionCommand("disable");

        b2 = new Button("Button2");
        
        b3 = new Button("Press me to Enable Button2");
        b3.setActionCommand("enable");
        b3.setEnabled(false);

        b1.addActionListener(this);
        b3.addActionListener(this);

        add(b1);
        add(b2);
        add(b3);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals("disable")) {
            b2.setEnabled(false);
            b1.setEnabled(false);
            b3.setEnabled(true);
        } else { 
            b2.setEnabled(true);
            b1.setEnabled(true);
            b3.setEnabled(false);
        }
    }
    
    public static void main(String[] args) {
        Frame frame = new Frame("ButtonDemo");

        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        frame.add(new ButtonDemo(), BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }
}