import java.util.Random;/*** derf*/
public class Operate {public static void main(String[] args) {int[][] arr = getArr(20);//获得二维一维长度相同的随机数数组forarr(arr);//遍历传入的数组sumarr(arr);//对二维数组求和int[] arr1 = {1, 2, 3, 4, 5, 6, 7, 8, 9};fZarr(arr1);//翻转传入的数组fzTo();//翻转输入这个两位数}//两个变量的反转private static void fzTo() {System.out.println();int a = 3, b = 9;System.out.print("a:" + a);System.out.println("        b:" + b);a = a ^ b;b = a ^ b;a = a ^ b;System.out.print("a:" + a);System.out.println("      b:" + b);}/*翻转数组*/private static void fZarr(int[] arr) {for (int i = 1, temp = 0; i <= arr.length / 2; i++) {temp = arr[i - 1];arr[i - 1] = arr[arr.length - i];arr[arr.length - i] = temp;}for (int i : arr) {System.out.print(i + " , ");}}/*对二维数组求和*/private static void sumarr(int[][] arr) {int sum = 0;for (int i = 0; i < arr.length; i++) {for (int i1 = 0; i1 < arr[i].length; i1++) {sum += i1;}}System.out.println("sum : " + sum);}/*遍历数组*/private static void forarr(int[][] arr) {System.out.println("遍历数组：");for (int i = 0; i < arr.length; i++) {System.out.print(i + ": ");for (int i1 = 0; i1 < arr[i].length; i1++) {System.out.print(arr[i][i1]);}System.out.println();}}/*** 返回一个随机二维数组*/public static int[][] getArr(int length) {int[][] arr = new int[length][length];Random random = new Random();for (int i = 0; i < length; i++) {for (int i1 = 0; i1 < length; i1++) {arr[i][i1] = random.nextInt(length);}}return arr;}}