import java.util.Date;
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public class Test extends Thread{ private int tortoise_walk = 0; // 乌龟已跑长度存放变量
private int rabbit_walk = 0; // 兔子已跑长度存放变量
private int finish = 1000; // 终点
private volatile boolean hasWinner = false;// 胜利者诞生 /**
*
* @ClassName: Tortoise_Run
* @Description: TODO(乌龟奔跑线程)
* @author guotingchao
* @date 2012-3-6 上午10:20:45
*
*/
class Tortoise_Run implements Runnable {
@Override
public void run() {
try {
while (!hasWinner) {
if (tortoise_walk % 100 == 0 (tortoise_walk != 0||tortoise_walk=finish)) { //乌龟每100米休息500毫秒
System.out.println("乌龟休息中………………");
Thread.sleep(500);
}
tortoise_walk++;
System.out.println("乌龟已跑"+tortoise_walk+"米");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} /**
*
* @ClassName: Rabbit_Run
* @Description: TODO(兔子奔跑线程)
* @date 2012-3-6 上午10:25:10
* @author guotingchao
*/
class Rabbit_Run implements Runnable {
@Override
public void run() {
try {
while (!hasWinner) {
if (rabbit_walk % 20 == 0 (rabbit_walk != 0||rabbit_walk=finish)) { //兔子每20米休息500毫秒
System.out.println("兔子休息中………………");
Thread.sleep(500);
}
rabbit_walk=rabbit_walk+5; //每秒跑5步
System.out.println("兔子已跑"+rabbit_walk+"米");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
@Override
public void run(){
new Thread(new Rabbit_Run()).start();
new Thread(new Tortoise_Run()).start();
}
/**
* @Title: main
* @Description: TODO(
* 赛程1000米，兔子跑5米，乌龟跑1米，兔子每20米休息500毫秒，乌龟每100米休息500毫秒。谁先到终点就结束程序
* ，并显示获胜方。)
* @param @param args
* @param @throws Exception 设定文件
* @author guotingchao
* @return void 返回类型
* @throws
*/
public static void main(String[] args) throws Exception {
long temp_actionTime=System.currentTimeMillis();
System.out.println("比赛开始："+new Date(temp_actionTime)+"毫秒");
Test t=new Test();
new Thread(t).start();
while(true){
if(t.tortoise_walk=t.finish||t.rabbit_walk=t.finish){
t.hasWinner=true;
break;
}
}
String winnnerName=t.tortoise_walkt.rabbit_walk?"乌龟":"兔子";
long temp_lastTime=System.currentTimeMillis();
System.out.println(winnnerName+"胜利");
System.out.println("比赛结束："+new Date(temp_lastTime)+"毫秒");
System.out.println("所耗时间："+(temp_lastTime-temp_actionTime)+"毫秒");
System.out.println("兔子="+t.rabbit_walk+" 乌龟="+t.tortoise_walk);
}
}
//不知道兔子和乌龟的步长时间是否按每秒。 这里程序只考虑依次递增频率
程序如下：
/**
*
* GuiTuSaiPao.java
* @author Antonio
* 2009年9月2日20:16:33
* 实现Runnable接口中的run方法
*
*/
public class GuiTuSaiPao implements Runnable {
private String name;
private int length=0;
public GuiTuSaiPao(){}
public GuiTuSaiPao(String name){
this.name=name;
}
public void run(){
while(true){
//每次停500毫秒
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
//向前跑十米
length+=10;
System.out.println(name+"已跑了"+length+"米.");
//到达终点
if(length=100){
System.out.println(name+",已经到达终点!");
//结束赛跑,break
break;
}
}
}
public static void main(String[] args) {
GuiTuSaiPao wugui=new GuiTuSaiPao("乌龟");
GuiTuSaiPao tuzi=new GuiTuSaiPao("兔子");
Thread thread=new Thread(wugui);
Thread thread2=new Thread(tuzi);
//启动线程
thread.start();
thread2.start();
}
}
输出结果：（不一定每次都一样！）
乌龟已跑了10米.
兔子已跑了10米.
兔子已跑了20米.
乌龟已跑了20米.
乌龟已跑了30米.
兔子已跑了30米.
兔子已跑了40米.
乌龟已跑了40米.
兔子已跑了50米.
乌龟已跑了50米.
乌龟已跑了60米.
兔子已跑了60米.
乌龟已跑了70米.
兔子已跑了70米.
乌龟已跑了80米.
兔子已跑了80米.
兔子已跑了90米.
乌龟已跑了90米.
兔子已跑了100米.
兔子,已经到达终点!
乌龟已跑了100米.
乌龟,已经到达终点!
完全看rp，这就是线程！
给分吧，哈哈
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; //定义一个JFrame窗体作为显示载体 public class TestTortoiseRabbit extends JFrame { private static final long serialVersionUID = 987654321L; static final int MAX_LENGTH = 700; private JButton begin = new JButton("开始"); private JButton exit = new JButton("退出"); private Rabbit rabbit = new Rabbit("兔子"); private Tortoise tortoise = new Tortoise("乌龟"); private JLabel stateOfRabbit = new JLabel(); private JLabel winner; public TestTortoiseRabbit() { super("龟兔赛跑"); setLayout(null); setBounds(200, 150, 800, 400); setDefaultCloseOperation(EXIT_ON_CLOSE); add(rabbit); rabbit.setBounds(20, 100, 50, 20); add(tortoise); tortoise.setBounds(20, 150, 50 ,20); add(stateOfRabbit); stateOfRabbit.setBounds(300, 50, 100 ,20); add(begin);begin.setBounds(20, 200, 80, 30); add(exit);exit.setBounds(100, 200, 80, 30); setVisible(true); begin.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { new Thread(rabbit).start(); new Thread(tortoise).start(); begin.setVisible(false); stateOfRabbit.setText("兔子跑起来了！"); } }); exit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); } public static void main(String[] args) { new TestTortoiseRabbit(); } class Tortoise extends JLabel implements Runnable { private static final long serialVersionUID = 12345678L; public Tortoise(String name) { super(name); } public Tortoise(Icon icon) { super(icon); } boolean stop; int speed = 2; int x, y; public void run() { x = getLocation().x; y = getLocation().y; while (!stop) { x += speed; setLocation(x, y); try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } if (x = MAX_LENGTH) { if (TestTortoiseRabbit.this.winner == null) { TestTortoiseRabbit.this.winner = this; } else { JOptionPane.showMessageDialog(TestTortoiseRabbit.this, TestTortoiseRabbit.this.winner.getText()+ "胜利!"); } stop = true; } } } } class Rabbit extends JLabel implements Runnable { private static final long serialVersionUID = 123456789L; public Rabbit(String name) { super(name); } public Rabbit(Icon icon) { super(icon); } boolean stop; int speed = 5; int x, y; Random r = new Random(); public void run() { x = getLocation().x; y = getLocation().y; while (!stop) { x += speed; setLocation(x, y); try { Thread.sleep(50); if(r.nextInt(100) 90){ if(speed == 0){ speed = 3; stateOfRabbit.setText("兔子跑起来了！"); }else{ speed = 0; stateOfRabbit.setText("兔子在睡觉！"); } } } catch (InterruptedException e) { e.printStackTrace(); } if (x = MAX_LENGTH) { stateOfRabbit.setText("兔子到终点了！"); if (TestTortoiseRabbit.this.winner == null) { TestTortoiseRabbit.this.winner = this; } else { JOptionPane.showMessageDialog(TestTortoiseRabbit.this, TestTortoiseRabbit.this.winner.getText()+ "胜利!"); } stop = true; } } } } }
LZ题目给的不是很准确。。跑道是否为环形跑道？
要用JAVA 写出来，首先就要去分析这道数学题中的逻辑问题
1：若为直线跑道，要有相遇 必然是乌龟在前，兔子在后。。定义为追击问题。。
求出速度差 v = 20 -10 = 10
追击路程为 s = 1000
可以得出相遇时间，也就是兔子追上乌龟的时间为 t = 1000/10 = 100(单位题目没有给出。分析应该是min 分钟)
2：若为环形跑道
一圈是多少米，题目没有给出。。故无法算出
分析完数学逻辑，再来写程序代码
public class Test9 {
public static void main(String[] args) {
//定义乌龟速度
int v1 = 10;
//定义兔子速度
int v2 = 20;
//定义整个路程
int sum = 1000;
//求出时间
double t = sum/(v2-v1);
System.out.println(t);
}
}
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