java二维数组中各个一维数组的长度可以不同吗?解决方案

public class testarray {    public static void main(String args[]){        int a[][] = new int[][]{{1,2},{3,4,5},{6},{7,8,9,10}};        for(int i = 0; i < a.length; i++){            for(int j = 0; j < a[i].length; j++)                System.out.print(" " + a[i][j]);            System.out.println("");        }                }}