Java 7：ThreadLocalRandom生成相同的随机数

问题描述

我正在尝试使用Java 7的和看到它在多个线程中生成完全相同的随机数。

I'm trying out Java 7's ThreadLocalRandom and see that it is generating exactly the same random numbers across multiple threads.

这是我的代码，我创建了5个线程，每个线程打印出5个随机数：

Here is my code, in which I create 5 threads and each thread prints out 5 random numbers:

//5 threads
for(int i = 0; i < 5 ; i++) {
    final Thread thread = new Thread() {
        @Override
        public void run() {
            System.out.print(Thread.currentThread().getName()+":");

            //each thread prints 5 random numbers
            for(int j = 0 ; j < 5; j++) {
                final int random = ThreadLocalRandom.current().nextInt(1,100);
                System.out.print(random + ",");
            }
            System.out.println();
        }
    };
    thread.start();
    thread.join();
}

输出：

Thread-0:1,93,45,75,29,
Thread-1:1,93,45,75,29,
Thread-2:1,93,45,75,29,
Thread-3:1,93,45,75,29,
Thread-4:1,93,45,75,29,

为什么我为每个线程和每次执行程序获得相同的随机数？

Why am I getting the same random numbers for each thread and for every execution of the program?

推荐答案

似乎有一个关于这个问题的漏洞。请参见和

Seems like there's an open bug regarding this issue. See here and here

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