package hanqi;import java.util.Scanner;public class Test7 {    public static void main(String[] args) {                int[][] m = {
   {3,2,6},{6,8,2,10},{5},{12,3,23}};        int[] n;        int len = 0;        for(int i = 0;i < m.length;i++){               len += m[i].length;                    //获取长度            }            //复制元素            n = new int[len];            int index = 0;            for(int i = 0;i < m.length;i++){                for(int j = 0;j < m[i].length;j++){                   n[index++] = m[i][j];                }             }            int z;                      for(int k=0;k
     
      n[j])                              {                                 z=n[k];                                 n[k]=n[j];                           n[j]=z;                        }                    }                   }        System.out.println(n[0]);        System.out.println(n[len-1]);                    }}