java:求二维数组之和

package day02;

public class ForTwoArray {
    public static void main(String[] args) {
        //二维数组循环遍历
        int[][] arr = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}};
         ForArray(arr);
    }

    public static void  ForArray(int[][] arr) {
        int sum=0;
        for (int i = 0; i < arr.length; i++) {//arr.length是统计二维数组中有几个一维数组
            for (int j = 0; j < arr[i].length; j++) {//arr[i].length是统计每个一维数组的长度
                sum=sum+arr[i][j];
                System.out.print(arr[i][j]);
            }
        }
        System.out.println("二维数组之和为："+sum);
    }
}