Comparator排序

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