java中的随机唯一编号 [英] random unique number in java

问题描述

我正在尝试获取一个随机数列表并将其放入队列而不重复随机数。

I'm trying to get a a list of random number and put it in queue without any repetition of the random number.

        int number = 40;

        for (int j = 0; j<number; j++)
        {
            int pick = random.nextInt(number);
            myQueue.add(Integer.toString(pick));
        }
        System.out.println("the queue size: "+myQueue.size());
        Iterator it = myQueue.iterator();
        while(it.hasNext()){
                String iteratorValue = (String)it.next();
                System.out.println("queue next value: "+iteratorValue);
        }

使用上面的代码，我得到了一些重复的随机数

with the above code, I got some repetition of the random number

任何人都知道该怎么做？

anyone know how to do it??

推荐答案

这个怎么样：

List<String> list = new ArrayList<String>(number);

for (int i = 0; i < number; i++)
    list.add(Integer.toString(i));

Collections.shuffle(list);

myQueue.addAll(list);

在某个范围内添加唯一随机数相当于添加范围内的所有数字然后洗牌结果。

"Adding unique random numbers" in some range is equivalent to adding all of the numbers in the range and then shuffling the result.

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