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[leetcode] Reverse Words in a String

2024-07-11 03:31:54   222人阅读

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

Clarification:
  • What constitutes a word?
    A sequence of non-space characters constitutes a word.
  • Could the input string contain leading or trailing spaces?
    Yes. However, your reversed string should not contain leading or trailing spaces.
  • How about multiple spaces between two words?
    Reduce them to a single space in the reversed string.

https://oj.leetcode.com/problems/reverse-words-in-a-string/

 

思路：用split方法分割后倒序遍历加入结果中即可。

 

/** * http://blog.csdn.net/perfect8886/article/details/20833685 *  * */public class Solution {    public String reverseWords(String s) {        String[] a = s.split(" ");        StringBuilder sb = new StringBuilder();        for (int i = a.length - 1; i >= 0; i--) {            if (!a[i].equals("")) {                sb.append(a[i]);                sb.append(" ");            }        }        if (sb.length() > 1)            sb.deleteCharAt(sb.length() - 1);        return sb.toString();    }    public static void main(String[] args) {        System.out.println(new Solution().reverseWords("the sky is blue"));    }}

 


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