java倒置字串

package com.video.test;public class MyTest {public static void main(String[] args) {String src = "123$456";String desc = reverseString(src);System.out.println(src);System.out.println(desc);//output//123$456//654$321}/** * 倒置字串 *  * @param str * @return */public static String reverseString(String str){char[] arr=str.toCharArray();int middle = arr.length>>1;//EQ length/2int limit = arr.length-1;for (int i = 0; i < middle; i++) {char tmp = arr[i];arr[i]=arr[limit-i];arr[limit-i]=tmp;}return new String(arr);}}