如何在二维数组中选择一个随机元素 [英] How to pick a random element in a 2 dimensional array

问题描述

好的，我想在二维数组中随机选择一个点，以便填充.我已经看到如何对一维数组执行此操作，并且想知道这在二维数组中如何实现.我所看到的关于这种方法的所有内容是再次出现相同的位置，这是一个小问题，但我首先不知道该怎么做.二维数组本质上是一个网格，维度是 x 和 y 坐标.并且在边界内选择一个点的随机元素(这是用户选择的，但对于这个问题的目的可以是 30x50.

Ok I want to pick a random point in the 2d array so it can be filled. Ive seen how to do this for a 1d array, and am wondering how this would be possible in a 2d array. All I have seen about this method is that the same position comes up again, which is a slight problem, but I don't know how to do it in the first place. The 2d array is essentially a grid, with the dimensions being the x and y coordinates. And the random element selecting a point within the boundaries (which is user selected but for the purposes of this problem can be 30x50.

  import java.util.Random;
class pickRand{
public static String get (int x, int y){
    int rndx = generator.nextInt(x) + 2;
    int rndy = generator.nextInt(y) + 2;


}
}

那么这是否可行，x 和 y 将对应于用户生成的数字，并且两侧都有一个凸起的边界 2 以防止任何对象移动(部分在网格之外或网格之外.不需要返回任何内容，对吗?

So would this work, the x and y will correspond to the user generated number and have a raised boundary of 2 either side to prevent any objects going (partially outside or of the grid. Nothing needs to be returned right?

推荐答案

如果你的网格大小为 M by N

• 在 0 和 M-1 之间生成一个随机数，比如 i
• 在 0 和 N-1 之间生成另一​​个随机数，比如 j

• Generate a random number between 0 and M-1 say i
• Generate another random between 0 and N-1 say j

(i,j) 将是二维数组的随机元素

(i,j) will be a random element of the 2d array

这篇关于如何在二维数组中选择一个随机元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！