如何防止重叠的随机数 [英] How can I prevent the overlapping random numbers

问题描述

我如何防止从随机数中复制数字。
我需要在1到9之间生成5个不同的数字。
我经常会得到像23334这样的数字，我该如何防止？
任何帮助都会很棒！

How would i prevent duplicating numbers from random numbers. I need to generate 5 numbers between 1 and 9 that are each different. I would often get same numbers like 23334, how can i prevent that? Any help would be great!

    int num2 = (int) Math.round((Math.random()*9) +1);
    int num1 = (int) Math.round((Math.random()*9) +1);
    int num5 = (int) Math.round((Math.random()*9) +1);
    int num3 = (int) Math.round((Math.random()*9) +1);
    int num4 = (int) Math.round((Math.random()*9) +1);

推荐答案

一种选择是使用shuffle算法（例如 Fisher-Yates shuffle ）随机生成序列从1到9，然后取序列的前5个数字

One option is to use shuffle algorithm (e.g. Fisher-Yates shuffle ) to generate random sequence from 1 to 9, then take first 5 numbers of the sequence

StackOverflow的进一步说明：https://stackoverflow.com/a/196065/950427

Further explanation on StackOverflow: https://stackoverflow.com/a/196065/950427

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