race.java

利用线程实现了线程间竞争资源的例子。例子中分别用两安钮模拟赛跑的跑车

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Race extends JFrame
{
	String winer="WINNER IS ";
	JButton b_go=new JButton("GO...");
	JButton b_r1=new JButton("R1");
	JButton b_r2=new JButton("R2");
	JLabel lalwin=new JLabel("");
	
	//定义界面
	public Race()
	{
		super("Race");
		
	    JPanel p = new JPanel();
		
		p.setLayout(null);
        p.setBackground(Color.PINK);
        getContentPane().add(p);
        
        b_go.setBounds(200,50,150,20);
        p.add(b_go);
        lalwin.setBounds(200,80,150,20);
        p.add(lalwin);
        b_r1.setBounds(485,100,62,20);
        b_r1.setBackground(Color.CYAN);
        p.add(b_r1);
        b_r2.setBounds(485,230,62,20);
        b_r2.setBackground(Color.MAGENTA);
        p.add(b_r2);
        
        this.setResizable(false);
        setSize(580,500);
        show();	
        
        b_go.addActionListener(new Start_Listener());
	}
	
	//线程Runner1
	class Runner1 extends Thread
  	{
		public Runner1()
		{
			Thread t=new Thread(this);
			t.start();
		}
		public void run()
		{
	   		while(true)
	   		{
	   			b_r1.setLocation(b_r1.getX()-15,100);
	   			try
	   			{
	   				this.sleep(300);
	   				if(b_r1.getX()<=50)
	   				{
	   					b_r1.setBackground(Color.YELLOW);
	   					this.destroy();
	   				}
	   			}
	   			catch(Exception e)
	   			{
	   				System.out.println(e);
	   			}
	   		}
		}	
	}
	
	//线程Runner2
	class Runner2 extends Thread
  	{
  		int displacement=485;
		public Runner2()
		{
			Thread t=new Thread(this);
			t.start();
		}
		public void run()
		{
			while(true)
	   		{
	   			b_r2.setLocation(b_r2.getX()-15,230);
	   			try
	   			{
	   				this.sleep(300);
	   				if(b_r2.getX()<=50)
	   				{
	   					b_r2.setBackground(Color.RED);
	   					this.destroy();	
	   				}
	   			}
	   			catch(Exception e)
	   			{
	   				System.out.println(e);
	   			}
	   		}
		}	
	}
	
	//按妞b_go的侦听类
	class Start_Listener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
    	{
    		new Runner1();
    		new Runner2();
		}
	}
	
	public static void main(String args[])
	{
		new Race();
	}
}