我是Java新手。我正在做一个小型程序实践，并且会丢失return语句错误。

有人可以帮忙吗？

import java.util.Scanner;
class nonstatic1
{
    public static void main(String[] args)
    {
        // this method works 
        nonstatic2 Ref=new nonstatic2(); 
        int Addition=Ref.add();           
        System.out.println (Addition);

         String email=email();

    }
       // the one below is the one that does not work and gives me the error
    public static String email()
    {
        Scanner in=new Scanner(System.in);
        System.out.println("Enter Your email Address");
        String email=in.nextLine();

        if(email.endsWith(".sc"))
          return email;
    }
}