twolisteninner.java

一个不错的java源码

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

public class TwoListenInner
{
	private Frame f;
	private TextField tf;
	public static void main(String args[])
	{
		TwoListenInner that=new TwoListenInner();
		that.go();
	}
	
	public void go()
	{
		f=new Frame("Two listeners' example");
		f.add("North",new Label("click and drag the mouse"));
		tf=new TextField(30);
		f.add("South",tf);
		f.addMouseMotionListener(new MouseMotionHandler());
		f.addMouseListener(new MouseEventHandler());
		f.setSize(300,300);
		f.setVisible(true);
	}
	
	public class MouseMotionHandler extends MouseMotionAdapter
	{
		public void mouseDragged(MouseEvent e)
		{
			String s="Mouse Dragging:x="+e.getX()+"Y="+e.getY();
			tf.setText(s);
		}
	}
	
	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 left the building";
		tf.setText(s);
		
	}
	
}
//基类对象可以由子类对象实现
//虽然interface是一个抽象类，但是它的实现必须使用implements关键字
//另外,在实现接口时，类中的函数返回值类型、函数名称、参数列表必须完全一致，只是不同类的函数体不同，当然，参数名称可以不一样