hw16_17.java

来自「Java程序设计实例」· Java 代码 · 共 33 行

import java.awt.*;
import java.awt.event.*;
public class hw16_17 extends Frame
{
   static hw16_17 frm=new hw16_17();
   static Label lab=new Label("");  
   static MouseLis mlis=new MouseLis(); 
   public static void main(String args[])
   { 
      frm.setSize(200,150);
      frm.setTitle("Mouse Event"); 
      frm.setLayout(null);
      lab.addMouseListener(mlis); 
      lab.setAlignment(Label.CENTER);
      lab.setBounds(20,40,160,80);
      lab.setBackground(Color.yellow);  
      frm.add(lab);       
      frm.setVisible(true);  
   }

   static class MouseLis extends MouseAdapter
   {
      public void mouseEntered(MouseEvent e)
      {
         lab.setText("mouse Enter");
      }
      public void mouseExited(MouseEvent e)
      {
         lab.setText(" ");
         lab.setText("mouse Exit");
      }
   }
}