testinner.java~25~

提供了常用的JAVA技术的示例

// 12-11  用 内部类 实现 监听 接口.

package TestInner;

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

public class TestInner {
    private Frame f=new Frame("用内部类实现监听接口");
    private Button b1=new Button("button 1");
    private Button b2=new Button("button 2");
    private Button b3=new Button("button 3");
    private Button b4=new Button("button 4");
    private TextArea ta=new TextArea();

    public TestInner() {
        f.setLayout(new BorderLayout());
        f.addWindowListener(new WindowClosing());

        b1.addActionListener(new ButtonHandler());
        b2.addActionListener(new ButtonHandler());
        b3.addActionListener(new ButtonHandler());
        b4.addActionListener(new ButtonHandler());

        b1.setActionCommand("难舍难分");
        ta.setBackground(Color.pink);
        b2.setActionCommand("button 2 was pressed");
        b3.setActionCommand("button 3 was pressed");
        b4.setActionCommand("button 4 was pressed");

        f.add(b1,"North");
        f.add(b2,"South");
        f.add(b3,"West");
        f.add(b4,"East");
        f.add("Center",ta);
        f.setSize(400,200);
        f.setBackground(Color.cyan);
        f.setVisible(true);

    }
    class ButtonHandler implements ActionListener{
        public void actionPerformed(ActionEvent e){
            String s=e.getActionCommand();
            ta.setText(s);

        }
    }
    class WindowClosing extends WindowAdapter{
        public void windowClosing(WindowEvent e){System.exit(1);}
    }
    public static void main(String[] args) {
      TestInner testInner1 = new TestInner();
    }
}