Java随机数，无重复 [英] Java Random number with no duplicate

问题描述

我需要在6个不同的edittext中生成随机数.不幸的是，随机数重复.我需要设定范围内的唯一数字.

I need to generate random numbers in 6 different edittext. Unfortunately the random numbers duplicates. I need unique numbers from the range I set.

        rndNumber = rndNumbers.nextInt(max);
        num1.setText(Integer.toString(rndNumber));


        rndNumber = rndNumbers.nextInt(max);
        num2.setText(Integer.toString(rndNumber));

        rndNumber = rndNumbers.nextInt(max);
        num3.setText(Integer.toString(rndNumber));

        rndNumber = rndNumbers.nextInt(max);
        num4.setText(Integer.toString(rndNumber));

        rndNumber = rndNumbers.nextInt(max);
        num5.setText(Integer.toString(rndNumber));

        rndNumber = rndNumbers.nextInt(max);
        num6.setText(Integer.toString(rndNumber));

推荐答案

包装随机数生成器以将结果存储在集合中.当您生成一个数字(如果该数字存在于集合中)时，请再次执行该操作:

Wrap the random number generator to store the results in a set. When you generate a number if it exists in the set, do it again:

其他人对for循环的评论也有效...

Comments made by others about the for loops are also valid...

伪代码:

class MyRandomNums {
    Set<Integer> usedNums;

    public int getRandom()
    {
        int num = random.nextInt();
        while(usedNums.contains(num)) {
            num = random.nextInt();
        }
        usedNums.add(num);
        return num;
    }

    public int reset()
    {
        usedNums.clear();
    }
}

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