Question

我正在尝试将数组的排列结果保存到2d数组中。假设我有一个数组{1,2,3,4}，我创建了一个带有行的2D数组：N！和列4.是否可以将所有结果保存到2D数组中。例如，我有以下输出，我想将其保存到2D数组中

[1、2、3、4] [1、2、4、3]

Answer 1

您的问题尚不清楚。万一您想知道如何创建和填充“ 2D数组”，这就是我可以告诉的内容：

import java.util.Arrays;

public class ArraysOfArrays {
    public static void main(String[] args) {
        // This is your '1D' array
        int[] init = {1, 2, 3, 4};

        //This is you '2D' array, 24 possibilities of 4 items in order
        int[][] combinations = new int[24][4];

        // fill your 2D array with the combinations you compute like that :
        combinations[0] = new int[] {1,2,3,4};
        combinations[1] = new int[] {1,2,4,3};
        combinations[2] = new int[] {1,3,2,4};
        combinations[3] = new int[] {1,3,4,2};
        combinations[4] = new int[] {1,4,2,3};
        combinations[5] = new int[] {1,4,3,2};
        //...
        combinations[23] = new int[] {4,3,2,1};

        // or you can assign the individual values one by one :
        combinations[0][0] = 1;
        combinations[0][1] = 2;
        combinations[0][2] = 3;
        combinations[0][3] = 4;

        System.out.println(Arrays.toString(combinations[3]));   
    }
}

希望有帮助！

Answer 2

如果要在“ 2D”数组中存储许多数组，请按如下所示使用循环：

      int size = 24;  //this should be n! for permutations of n values.
      combs[][] = new int[size][];
      for (int i = 0; i < size; i++) {
          combs[i] = getNextPermutationArray();
      }

并且Java没有真正的多维数组。它只是具有数组等的数组。

将数组置换的输出保存到2D数组中

2 个答案: