java - 递归查找句子中最长的单词

Question

所以我需要递归地找到最长的单词，我已经编写了代码，但是它不起作用，而且我不知道要修复什么。

        public static String longestWord(String sentence)
{
    int i = sentence.indexOf(" ");

    if (i==-1){
        return sentence;
    }

    else{
        String first = sentence.substring(0,i);
        String rest = sentence.substring(i+1);

            if(first.length()>=rest.length()){
                return longestWord(first);
            }
        else{
            return longestWord(rest);

        }

    }
}

Answer 1

行:

if(first.length() >= rest.length())

应该这样读:

String res = longestWord(rest);
if(first.length() >= res.length())