buttondemo2.java

提供了常用的JAVA技术的示例

package ButtonDemo2;

import java.awt.*;
import java.awt.event.*;
import javax.swing.AbstractButton;

public class ButtonDemo2 extends Panel implements ActionListener{
    protected Button b1,b2,b3;

    public ButtonDemo2() {

        b1=new Button("press me to disable 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")){
            b1.setEnabled(false);
            b2.setEnabled(false);
            b3.setEnabled(true);
        }else{
            b1.setEnabled(true);
            b2.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 ButtonDemo2(),BorderLayout.CENTER);
      frame.pack();
      frame.setVisible(true);
    }
}