1、遍历二维数组并求和。

        
        int arr[][]=new int[][]{{12,8,45},{11,34,23,76}};
         
         int sum = 0;
        
         System.out.println("数组元素是:");
         
         for (int c[]:arr)
   {
        for (int b:c)
        {
             System.out.print(b+" ");
             
             sum+=b;
        }    
        System.out.println();
   }
        
        System.out.println("数组和为:"+sum);
            
    }
            
}

数组元素是:
12 8 45
11 34 23 76
数组和为:209