在 Java 中对二维数组进行排序 [英] Sorting a 2d array in Java

问题描述

我很难弄清楚对二维整数数组进行排序的一行代码的细节.

Im having a little of a hard time figuring out the specifics of a line of code that sorts a 2d array of integers.

正在排序的数组是一个数组，里面的数组只有两个数字，我想弄清楚 (a, b) 是否指的是两个单独的二维数组，如果 (a[0] , b[0]) 指的是二维数组中的数字?

The array that is being sorted is an array that has arrays inside that only have two numbers, I am trying to figure out if (a, b) refers to two separate 2d arrays and if (a[0] , b[0]) refers to the numbers within the 2d arrays?

Arrays.sort(sortedIntervals, (a, b) -> Integer.compare(a[0], b[0]));

推荐答案

您可以使用密钥提取器和比较器链:

int[][] arr2d = {{1, 3, 6}, {1, 2, 3}, {0, 2, 3}};

// sorting the rows of a 2d array first by
// the first column, then by the second column
Arrays.sort(arr2d, Comparator
        .<int[]>comparingInt(row -> row[0])
        .thenComparingInt(row -> row[1]));

System.out.println(Arrays.deepToString(arr2d));
// [[0, 2, 3], [1, 2, 3], [1, 3, 6]]

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