有如下定义：int[][] arr2 = new int [3][];arr2 [0] = new int [2] ;arr2 [1] = new int [4] ;arr2 [2] = new int [3] ;输出该数组所有元素值，代码如下：for (int i = 0 ; i<_________ ; i++){for (int j = 0 ; j< ____________; j++)System.out.println( arr2[i][j]);}空1应该填写 ：__________；空2应该填写 ：___________;