创建两个对象，兔与龟，实现龟兔赛跑的过程 要求：兔子在跑到一半时睡觉，乌龟一直爬行，直到最后获得胜利。

在Java中，我们可以创建一个名为`Race`的类来模拟龟兔赛跑的过程，分别代表兔子和乌龟。这里有一个简化的示例：

import java.util.concurrent.TimeUnit;

class Animal implements Runnable {
    private String name;
    private double speed;

    public Animal(String name, double speed) {
        this.name = name;
        this.speed = speed;
    }

    @Override
    public void run() {
        while (!isVictory()) {
            System.out.printf("%s is running at %.2f units per second.\n", name, speed);
            try {
                Thread.sleep(TimeUnit.SECONDS.toMillis(1));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(name + " wins the race!");
    }

    protected abstract boolean isVictory();  // 子类需实现此方法
}

class Rabbit extends Animal {
    public Rabbit(double speed) {
        super("Rabbit", speed);
    }

    @Override
    protected boolean isVictory() {
        return getDistanceCovered() >= 0.5;  // 兔子达到终点半程即视为失败
    }

    private double getDistanceCovered() {
        return speed * getRuntimeInSeconds();
    }

    private double getRuntimeInSeconds() {
        return getThread().getStackTrace()[1].getLineNumber() / 2;  // 模拟兔子跑了一半路程就睡了
    }
}

class Turtle extends Animal {
    public Turtle(double speed) {
        super("Turtle", speed);
    }

    @Override
    protected boolean isVictory() {
        return true;  // 因为乌龟一直在爬，只要比赛不停止，它总是赢家
    }
}

public class Race {
    public static void main(String[] args) {
        Rabbit rabbit = new Rabbit(5);  // 兔子速度较快
        Turtle turtle = new Turtle(1);   // 乌龟速度较慢

        Thread rabbitThread = new Thread(rabbit);
        Thread turtleThread = new Thread(turtle);

        rabbitThread.start();
        turtleThread.start();

        try {
            rabbitThread.join();
            turtleThread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

在这个示例中，`Animal`是抽象类，`Rabbit`和`Turtle`作为它的子类实现了`run()`方法。`Rabbit`会在运行到一定距离后暂停，而`Turtle`始终保持活动状态直至比赛结束。