关于字符串翻转的几种方法

import java.util.ArrayList; /** * Created by d007l on 2017/3/12. */ public class ReverseTest { public static void main(String[] args){ String str = "偷得浮生半日闲"; System.out.println("翻转前的字符串展示是：\n" + str); System.out.println("翻转后的字符串展示是：\n" + myTurn(str)); reverse(str); myReverse(str); } //利用ArrayList，如果讲究格式的话，需要复写一下toString方法 public static ArrayList<Character> myTurn(String str){ char[] arr = str.toCharArray(); ArrayList<Character> list = new ArrayList<Character>(); for(int i = arr.length -1;i>=0;i--){ list.add(arr[i]); } return list; } //该方法是直接进行字符数组赋值 public static void reverse(String str){ char[] arr = str.toCharArray(); char[] newArr = new char[arr.length]; int index = 0; while (index < arr.length){ newArr[arr.length-index-1] = arr[index]; index++; } System.out.println(); for(char c :newArr) System.out.print(c); } //StringBuilder，字符串缓冲类 public static StringBuilder myReverse(String str){ char[] arr = str.toCharArray(); StringBuilder sb = new StringBuilder(); for(int i = 0;i < arr.length;i++){ sb.append(arr[i]); } return sb; } }