LeetCode怎样翻转字符串中的单词

示例：
输入："Let's take LeetCode contest"输出："s'teL ekat edoCteeL tsetnoc" 
提示：
在字符串中，每个单词由单个空格分隔，并且字符串中不会有任何额外的空格。
 

public class ReverseWordsTest3 {    public static void main(String[] args) {        String str = "Let's take LeetCode contest";        String reverseWords = reverseWords(str);        System.out.println("reverseWords = " + reverseWords);    }
    public static String reverseWords(String s) {        if (s == null || s.length() == 0) {            return s;        }        String[] strings = s.split(" ");        StringBuilder stringBuilder = new StringBuilder(s.length());        for (String s1 : strings        ) {            StringBuilder t = new StringBuilder();            t.append(s1);            stringBuilder.append(t.reverse().toString());            stringBuilder.append(" ");        }        return stringBuilder.substring(0,stringBuilder.length() - 1);    }}