JAVA多线程编程实现龟兔赛跑
Java的多线程建立在Thread类和Runnable接口上，可以通过继承Thread类和实现Runnable接口创建一个线程。
实现Runnable接口的类需要实例化run()方法。
实例化Thread类可以创建一个新的线程：我们可以创建一个类扩展Thread类，并且代码覆盖run()方法，与此同时用new创建一个线程的对象，当然还要调用start()方法来启动线程。
isAlive()方法判断一个线程是否结束。
下面简单用线程编写龟兔赛跑。
//跑道
import java.awt.*;
import java.awt.event.*;
public class Chang extends Frame implements ActionListener
{
private Button quit = new Button("Quit");
private Button start = new Button("比赛");
//private Button halt = new Button("睡觉");
private Wg wg = null;
private Tz tz = null;
//Image wgg = Toolkit.getDefaultToolkit().getImage("wgg.GIF");
public Chang()//跑道
{
super("龟兔赛跑");
this.setLayout(new FlowLayout());//按钮浮于上方
add(quit); quit.addActionListener(this);
add(start); start.addActionListener(this);
//add(halt); halt.addActionListener(this);
validate();
setSize(500,500);
setVisible(true);
int x = 100;//产生乌龟
int y = 0;
int x2 = 200;//产生兔子
int y2 = 0;
this.wg = new Wg(this,x,y);
this.tz = new Tz(this,x2,y2);
this.repaint();
}
public void paint(Graphics g)
{
//if(wg[0] != null)
wg.draw(g);
tz.draw(g);
g.fillRect(0, 450, 500, 10);
}
public void actionPerformed(ActionEvent arg)
{
if(arg.getSource() == start)
{
wg.start();
tz.start();
}
if(arg.getSource() == quit)
System.exit(0);
}
public static void main(String args[])
{
Chang table = new Chang();
}
}
//兔子
import java.awt.Color;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.Graphics;
public class Tz extends Thread
{
private int xdir = 0;
private int ydir = 10;//单位时间跑3
private boolean running = false;
private Chang chang = null;//操场
int x,y,time = 0;
Image tzz = Toolkit.getDefaultToolkit().getImage("tzz.jpg");
Image shu = Toolkit.getDefaultToolkit().getImage("shu.jpg");
public Tz(Chang _chang,int _x,int _y)
{
this.chang = _chang;
this.x = _x;
this.y = _y;
start();
}
public void start ()
{
running = true;
super.start();
}
public void halt( )//中止
{
running = false;
}
public void run()
{
while ( running)
{
move();
try {
sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
chang.repaint();
}
}
public void move( )
{
if(y <= 450)
{
if(y == 200)//兔子睡觉
{
try {
sleep(9000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
y = y + 10;
}
}
public int getx() {
return x;
}
public int gety() {
return y;
}
void draw(Graphics g)
{
g.setColor(Color.RED);
g.drawImage(tzz, x, y, 30, 40, chang);
g.drawImage(shu,240,200,30,40,chang);
}
}
//乌龟
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
public class Wg extends Thread
{
int xdir = 0;
int ydir = 3;//单位时间跑3
private boolean running = false;
private Chang chang = null;//操场
int x,y;
Image wgg = Toolkit.getDefaultToolkit().getImage("wgg.jpg");
public Wg(Chang _chang,int _x,int _y)
{
this.chang = _chang;
this.x = _x;
this.y = _y;
start();
}
public void start ()
{
//Thread w = new Thread(this,"wgg");
running = true;
super.start();
}
public void halt()//中止
{
running = false;
}
public void run()
{
while(running)
{
move();
try{
sleep(100);
}catch(InterruptedException ie){
System.err.println("Thread interrupted");
}
chang.repaint();
}
}
public void move()
{
if(y <= chang.getSize().width-50)
{
x += xdir;
y += ydir;
}
}
public void draw(Graphics g)
{
g.drawImage(wgg, x, y, 30, 40, chang);
}
}
本人仍处于学习阶段，所以有什么不对的，请大家多多指教。