从数组中选择一个随机值 [英] Select a random value from an Array

问题描述

我有一个数值数组，我想从该数组中随机选择一个值，然后将其插入到 int 变量中.

I have an Array of number values, and I want to randomly select a value from in that array and then insert it in to an int variable.

我不确定您需要查看什么代码.所以，

I'm not sure what code you will need to see. So,

这是我用来生成 13 个数字 (1-13) 并将它们插入到数组中的 for 循环.

Here is the for loop that I'm using to generate 13 numbers (1-13) and insert them in to the Array.

    int clubsArray []; 
    clubsArray = new int [13]; 

    for(int i = 0; i < clubsArray.length; i++) { 

        clubsArray[i] = i +1; 

    }

这很好用，但现在我需要从该数组中选择例如 2 个随机值(然后将其插入到稍后使用的变量中.

That works fine, but now I need to select for example 2 random values from in that array (and then insert it in to a variable to be used later on.

我在许多网站上环顾四周，看到诸如 ArrayList 之类的东西，以便将值插入到数组中，然后使用 Random generator = new Random() 从数组中选择值，然后 .remove() 从数组中删除它.但是当我使用它时它不起作用.

I've looked around on many websites and I've seen things like ArrayList<String> in order to insert values in to an Array and then use Random generator = new Random() to select the value from the array and then .remove() to remove it from the array. But when ever I have used that it doesn't work.

推荐答案

只要 clubsArray[new Random().nextInt(clubsArray.length)] 就可以了

或者要随机化元素的顺序，使用ListclubsList=Arrays.asList(clubsArray);Collections.shuffle(clubsList);.

Or to randomize the order of elements, use List<?> clubsList=Arrays.asList(clubsArray); Collections.shuffle(clubsList);.

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