1、遍历二维数组并求和。

 1         
 2         int arr[][]=new int[][]{{12,8,45},{11,34,23,76}};
 3          
 4          int sum = 0;
 5         
 6          System.out.println("数组元素是:");
 7          
 8          for (int c[]:arr)
 9    {
10         for (int b:c)
11         {
12              System.out.print(b+" ");
13              
14              sum+=b;
15         }    
16         System.out.println();
17    }
18         
19         System.out.println("数组和为:"+sum);
20             
21     }
22             
23 }