java 求解二维数组列最小值

import java.util.Arrays;  public class Col {    public static int[] getColMin(int a[][]) {     int[] res = new int[a.length];     for (int i = 0; i < a.length; i++) {       int[] s = a[i];       Arrays.sort(s);       res[i] = s[0];     }     return res;   }      public static void main(String args[]) {     // 写测试方法     int[][] a = { { 5, 6, 1, 16 }, { 7, 3, 9 }, { 2, 4, 56 } };     int[] ss = getColMin(a);     for (int i = 0; i < ss.length; i++) {       System.out.print(ss[i] + " ");     }   } }