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 = { { 5,16 },{ 7,9 },{ 2,4,56 } }; 
    int[] ss = getColMin(a); 
    for (int i = 0; i < ss.length; i++) { 
      System.out.print(ss[i] + " "); 
    } 
  } 
}