Thread_project/Thread_case_module/src/Thread_case1_package/MyThread.java

package Thread_case1_package;

import java.util.Random;

public class MyThread extends Thread {

    //共享数据
    //100块，分成了3个包
    static double money = 100;
    static int count = 3;

    //最小的中奖金额
    static final double MIN = 0.1;

    @Override
    public void run() {
        synchronized (MyThread.class) {
            if (count == 0) {
                System.out.println(getName() + "没有抢到红包！");
            } else {
                double prize = 0;
                if (count == 1) {
                    //表示此时是最后一个红包
                    //就无需随机，剩余所有钱都是中奖金额
                    prize = money;
                } else {
                    //表示第一次，第二次（随机）
                    Random r = new Random();

                    double bounds = money - (count - 1) * MIN;
                    prize = r.nextDouble(bounds);
                    if (prize < MIN) {
                        prize = MIN;
                    }
                }

                //从money当中，去掉当前中奖的金额
                money -= prize;
                //红包个数-1
                count--;
                //本次红包的信息打印
                System.out.println(getName() + "抢到了" + prize + "元");
            }
        }
    }
}