LeetCode557-20.8.30-反转字符串的单词

链接：LeetCode557
过程：略
思路：遍历字符串反转单词
代码：

class Solution {
    public String reverseWords(String s) {
        StringBuilder sb=new StringBuilder();
        StringBuilder ans=new StringBuilder();
        int pr=0;
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)==' '){
                sb=new StringBuilder(s.substring(pr,i));
                ans.append(sb.reverse()).append(" ");
                pr=i+1;
            }
            if(i==s.length()-1){
                sb=new StringBuilder(s.substring(pr,s.length()));
                ans.append(sb.reverse());
            }
        }
        return ans.toString();
    }
}