557. Reverse Words in a String III

原创于 2017-04-30 09:57:42 发布 · 322 阅读

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#LeetCode #String #Reverse Words in a S

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本文介绍了一种方法，用于反转字符串中每个单词内的字符顺序，同时保持单词原有的顺序不变。通过使用split()方法分割字符串，并借助StringBuilder进行反转操作，最终实现了高效地处理。

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Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

首先把字符串按照“ ”分割，然后挨个反转，最后拼接起来。代码如下：

public class Solution {
    public String reverseWords(String s) {
        String[] strs = s.split("\\s", -1);
        StringBuilder sb = new StringBuilder();
        StringBuilder res = new StringBuilder();
        for (String str: strs) {
            sb.replace(0, sb.length(), str);
            res.append(sb.reverse()).append(" ");
        }
        return res.deleteCharAt(res.length() - 1).toString();
    }
}