逆序输出字符串的单词——Leetcode系列(二)

本文介绍了一种使用Java实现的方法,该方法可以将输入字符串中的单词顺序进行反转,同时处理了单词之间的多余空格及前后空白字符的问题。

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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.
My Answer:

public class Solution {
    public String reverseWords(String s) {
        String[] array = s.split(" ");
        StringBuilder builder = new StringBuilder();
        String space = " ";
        int length = array.length - 1;
        for(int i = length; i >= 0; i--){
            String cleanStr = array[i].trim();
            if(cleanStr.length() == 0){
                continue;
            }
            
            builder.append(cleanStr);
            builder.append(space);
        }
        return builder.toString().trim();
    }
}


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