example4_10.java

来自「书中的例题」· Java 代码 · 共 41 行

import java.awt.* ;
import java.awt.event.*;
public class Example4_10
{
  private Frame win;
  private TextField text;
  
  public Example4_10()
  {
    win=new Frame("内部类");
    text=new TextField(30);
   }

  public void inFrame()
  {
    Label label=new Label("点击并拖曳鼠标");
    win.add(label,BorderLayout.NORTH);
    win.add(text,BorderLayout.SOUTH);
     /*参数为内部类对象*/
	win.addMouseMotionListener(new MyMouseMotionListener());
    win.setSize(300,200);
    win.setVisible(true); 
   }

  /*内部类开始*/
  class MyMouseMotionListener extends MouseMotionAdapter
   {
     public void mouseDragged(MouseEvent e)
	  {
       String s="Mouse dragging: x="+e.getX()+"  Y="+e.getY();
       text.setText(s);
	  }
    } /*内部类结束*/
   
   public static void main(String args[]) {
    Example4_10 w=new Example4_10();
    w.inFrame();
   }
  }