用Java代碼實(shí)現(xiàn)馬匹賽跑

　　下面是一個(gè)基于Java多線程的賽馬游戲示例，該示例中有5匹賽馬，每匹賽馬都是一個(gè)線程。每匹賽馬都有一個(gè)速度和一個(gè)起跑線的位置，他們將在屏幕上移動(dòng)，直到達(dá)到終點(diǎn)線。

import java.util.Random;

public class Horse implements Runnable {
    private static int counter = 0;
    private final int id = counter++;
    private int strides = 0;
    private static Random rand = new Random();
    private static final int FINISH_LINE = 75;
    private Race race;

    public Horse(Race race) {
        this.race = race;
    }

    public synchronized int getStrides() {
        return strides;
    }

    @Override
    public void run() {
        try {
            while(!Thread.interrupted()) {
                synchronized(this) {
                    strides += rand.nextInt(3);
                }
                Thread.sleep(200);
                race.printHorses();
                if(strides >= FINISH_LINE) {
                    race.win(this);
                    return;
                }
            }
        } catch(InterruptedException e) {
            System.out.println("Horse " + id + " interrupted");
        }
    }

    @Override
    public String toString() {
        return "Horse " + id;
    }
}

public class Race {
    private Horse[] horses;
    private int numHorses;
    private static final int FINISH_LINE = 75;
    private volatile Horse winner;

    public Race(int numHorses) {
        this.numHorses = numHorses;
        horses = new Horse[numHorses];
        for(int i = 0; i < numHorses; i++) {
            horses[i] = new Horse(this);
        }
    }

    public void startRace() {
        System.out.println("Starting the race...");
        for(Horse horse : horses) {
            new Thread(horse).start();
        }
    }

    public void win(Horse horse) {
        synchronized(this) {
            if(winner == null) {
                winner = horse;
                System.out.println("Winner: " + winner);
            }
        }
    }

    public void printHorses() {
        for(int i = 0; i < 10; i++) {
            System.out.println();
        }
        for(int i = 0; i < numHorses; i++) {
            System.out.print(horses[i] + ": ");
            for(int j = 0; j < horses[i].getStrides(); j++) {
                System.out.print("*");
            }
            System.out.println();
        }
        try {
            Thread.sleep(15);
        } catch(InterruptedException e) {
            System.out.println("Interrupted while printing horses");
        }
    }
}

public class RacingGame {
    public static void main(String[] args) {
        Race race = new Race(5);
        race.startRace();
    }
}

　　在這個(gè)示例中，每匹馬都有一個(gè)隨機(jī)生成的速度，每次移動(dòng)一定的步數(shù)。每匹馬都有一個(gè)起跑線的位置，當(dāng)它們?cè)竭^(guò)終點(diǎn)線時(shí)，會(huì)觸發(fā)一個(gè)“勝利”的方法，并且在控制臺(tái)上輸出獲勝馬匹的信息。

　　在'Race'類(lèi)中，'startRace()'方法啟動(dòng)每個(gè)馬匹線程，每個(gè)線程都運(yùn)行一個(gè)'Horse'。