java sorting two-dimensional arrays

Code:

arr means the orderArray。

        int[][] arr = new int[n][];
        Arrays.sort(arr, new Comparator<int[]>() {
            @Override
            public int compare(int[] o1, int[] o2) {
                return o1[0] - o2[0];
            }
        });

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Available incompareThe custom sorting order is in it, and the index in the array specifies which element is sorted according to.

The above code is sorted ascending. When the code in the method is replaced with the following code, it means sorting in descending order.

 return o2[0] - o1[0];

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