LeetCode oj 344. Reverse String（字符串）

344. Reverse String

 

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Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

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字符串翻转

直接翻转的话肯定超时，不然这道题就没有存在的意义了，从两边向中间翻转，可以节约一半的时间

public class Problem344 {public static String reverseString(String s) {char[] str = s.toCharArray();int len = s.length();char strTemp;for(int i=0;i<len/2;i++){strTemp = str[i];str[i] = str[len-1-i];str[len-1-i] = strTemp;}return new String(str);}public static void main(String [] args){System.out.println(reverseString("Heallo"));}}