Java算法——二维数组的遍历，求和

public class Array2BianLi {
 
    public static void main(String[] args) {
 
        int[][] arr = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
 
        int sum = 0;
        System.out.println("遍历二维数组：");
 
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[i].length; j++) {
                System.out.print(arr[i][j] + " ");
                sum += arr[i][j];
            }
            System.out.println();
        }
        System.out.println("所有元素总和为：" + sum);
    }
 
}