题解 | #翻转单词序列#

public class Solution {
    public String ReverseSentence(String str) {
        StringBuilder ans = new StringBuilder();
        int i=0;
        while(true)
        {
            StringBuilder tmp = new StringBuilder();
//             System.out.println(str.charAt(i));
            while(i<str.length()&&str.charAt(i)!=' ')
            {
                tmp.append(str.charAt(i));
                i++;
            }
            
//             System.out.println(tmp);
            if(i==str.length())
            {
                ans.insert(0,tmp.toString());
                 break;
            }
            ans.insert(0,tmp.toString());
            ans.insert(0,' ');
            i++;
        }
        return ans.toString();
//         return ans;
    }
}