threelisteninner.java~20~

提供了常用的JAVA技术的示例

// P136  例 5-30 包含三个内部类的使用。

package ThreeListenInner;

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

public class ThreeListenInner {

    private Frame f;
    private TextField tf;
    private Button bt;
    public static void main(String s[]){
        ThreeListenInner th=new ThreeListenInner();
        th.go();
    }

    public void go(){
        f=new Frame("Three listers example");
        //f.add()
        f.add("North",new Label("click and drag the mouse"));
        tf=new TextField(30);
        bt=new Button("close");
        bt.setSize(10,5);
        bt.setBounds(10,0,10,40);
        f.add("South",tf);
        f.add("West",bt);


        f.addMouseMotionListener(new MouseMotionHandler());
        f.addMouseListener(new MouseEventHandler());
        f.addWindowListener(new  WindowEventHandler());
        f.setSize(300,300);
        f.setBackground(Color.white);
        f.setVisible(true);
    }

    // 内 部 类
    public class MouseMotionHandler extends MouseMotionAdapter{
        public void mouseDragged(MouseEvent e){
            String s="Mouse dragging: x= "+e.getX()+"y= "+e.getY();
            tf.setText(s);
        }
    }

    // 内 部 类
    public class MouseEventHandler extends MouseAdapter{
        public void mouseEntered(MouseEvent e){
            String s="the mouse entered" ;
                        tf.setText(s);
        }
        public void mouseExited(MouseEvent e){
            String s="the mouse has left the building";
            tf.setText(s);
            }
        public void mouseClicked(MouseEvent e){
            String s="the mouse has click the building";
            tf.setText(s);
            }
    }

    // 内 部 类
    public class WindowEventHandler extends WindowAdapter{
        public void windowClosing(WindowEvent e){
            System.exit(0);
        }
    }

}