题目

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.

代码

注意空格。。。。最后一个单词后面不追加空格

class Solution {
    public String reverseWords(String s) {
        StringBuilder result = new StringBuilder();
        String[] Words = s.split(" ");
        int len = Words.length;
        for(int i=0;i<len;i++){
            String Word = Words[i];
            int len1 = Word.length();
            int l = len1/2;
            char[] x = Word.toCharArray();
            for(int j = 0;j<l;j++){
                char t = x[j];
                x[j] = x[len1-j-1];
                x[len1-j-1] = t;
            }
            Word = new String(x);
            if(i!=len-1){
                Word+=" ";
            }
            result.append(Word);
        }
        return result.toString();
    }
}