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- public class Array2Demo {
- public static void main(String args[]) {
- //int[] arr = new int[3];//一维数组
- //int[][] arr = new int[3][4]; //定义了名称为arr的二维数组
- //System.out.println(arr);
- // int [][] arr =new int[3][];//数组没有初始化 默认是null
- // arr[0] = new int[3];//二维数组中的第一个引用指向了一个小的数组
- // arr[1] = new int[1];
- // arr[2] = new int[2];
- // System.out.println(arr.length);//打印的是二维数组的长度
- // System.out.println(arr[0].length);//打印二维数组中第一个一维数组的长度
- int[][] arr = {{1, 2, 3}, {4, 5, 6, 9, 9, 9}, {7, 8, 9}};
- int sum = 0;
- for (int x = 0; x < arr.length; x++) {
- for (int y = 0; y < arr[x].length; y++) {
- sum = sum + arr[x][y];
- }
- }
- System.out.print(sum);
- }
- }
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