testaddlistener.java~16~

提供了常用的JAVA技术的示例

// 12-9   给 按 钮 添 加 监 听 器 。
package AddListener;

import java.awt.*;
import java.awt.event.*;
import java.awt.AWTEvent;

public class TestAddListener implements ActionListener,WindowListener{
    Frame f;
    Button b;

    public void create() {
        f=new Frame("testing");
        b=new Button("press");
        b.addActionListener(this);// 注 册 监 听 器
        f.addWindowListener(this);
        f.add(b,"North");
        f.setSize(200,200);
        f.setVisible(true);
    }

    public void actionPerformed(ActionEvent e){
        System.out.println("the button is pressed");
    }
    // 如果继承了接口 WindowListener ，下面 7 个方法都要写，否则出错！
    public void windowActivated(WindowEvent e){}
    public void windowClosed(WindowEvent e){}
    public void windowClosing(WindowEvent e){System.exit(1);}
    public void windowDeactivated(WindowEvent e){}
    public void windowDeiconified(WindowEvent e){}
    public void windowIconified(WindowEvent e){}
    public void windowOpened(WindowEvent e){}

    public static void main(String[] args) {
      TestAddListener test = new TestAddListener();
      test.create();
    }

}