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);}}