221231 2차원 배열 정렬

Comparator

import java.util.Comparator;

Arrays.sort(arrays, new Comparator<int[]>() {
  @Override
  public int compare(int[] o1, int[] o2) {
    if (o1[0] == o2[0])
      return o1[1] - o2[1];
    else
      return o1[0] - o2[0];
  }
});

람다식

import java.util.Arrays;

Arrays.sort(arrays, (o1, o2) -> o1[0] == o2[0] ? o1[1] - o2[1] : o1[0] - o2[0]);