String类中的练习

package com.jenthor;public class StingTest {/* * 练习二：将字符串反转 */public static void main(String[] args) {String s = "abcdef";char[] chs = s.toCharArray();printArray(chs);reverse(chs);printArray(chs);}public static void reverse(char arr[]) {for (int start = 0, end = arr.length - 1; start < end; start++, end--) {swap(arr, start, end);}}private static void swap(char[] arr, int x, int y) {char temp = arr[x];arr[x] = arr[y];arr[y] = temp;}public static void printArray(char arr[]) {System.out.print("[");for (int i = 0; i < arr.length; i++) {if (i != arr.length - 1)System.out.print(arr[i] + ",");elseSystem.out.println(arr[i] + "]");}}}