清华大学第二版

				程序5-16
				
				import java.awt.*;
				import java.awt.event.*;
				
				public class TwoListenInner{
					// 不影响其他成员变量和方法
				
					public void go(){
					......
					f.addMouseMotionListener(new TwoListenInner$MouseMotionHandler(this));
					......
					}
				
					class TwoListenInner$MouseMotionHandler extends MouseMotionAdapter{
						private TwoListenInner this$0;
				
						// 编译器自动生成结构
						TwoListenInner$MouseMotionHandler(TwoListenInner this$0);
						this.this$0 = this$0;
					}
					public void mouseDragged (MouseEvent e){
						String s="Mouse dragging: X="+e.getX() +"Y="+e.getY();
						this$0.tf.setText(s);
					}
				}