JAVA:缺少返回语句 [英] JAVA: missing return statement

问题描述

到目前为止，我对这段代码的主要担忧是缺少 return 语句.

my main concern with this code as of right now is a missing return statement.

public class stringstuff{

    //using charAt    
    public static String ReverseF(String n){
        String finalstring = "";
        int len = n.length();
        for (int i = 0; (i < n.length()); i++){
            finalstring += (n.charAt(len - i - 1));
        }
        System.out.println(finalstring);
    }

    public static void main(String[]args){
        ReverseF("Hello");
    }
}

使用此代码我只会收到错误:

Using this code I only get the error:

stringstuff.java:11: missing return statement
}
^
1 error

如果我切换 System.out.println 返回，我不会收到任何错误，但我也不会得到 ReverseF("Hello") 的答案；

If I switch the System.out.println to return, I don't get any errors but I also don't get an answer for ReverseF("Hello");

推荐答案

你有两个选择:要么写

public static void /* not String */ ReverseF(String n){

或者在ReverseF中写return finalString并使用

public static void main(String[]args){
  System.out.println(ReverseF("Hello"));
}

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