导入扫描仪类时出现问题

Question

I am trying to execute the following code but keep getting this error:

Error: Main method not found in class ScannerDemo, please define the main method as: public static void main(String[] args)

import java.util.Scanner;
class ScannerDemo
public class Main {

    public static void main (String [] args)
    {
        Scanner sc = new Scanner(System.in);
        String userName;

        System.out.println("Enter a number");
        username = sc.nextLine();
        System.out.println("your number is" + username + "enter your next number");
        username2 = sc.nextline();
        System.out.println("your total is" + username2 );     
    }
}

I think I must be importing the Scanner class wrong, I have tried different methods but nothing has worked for me yet.

Answer 1

You have two class declarations in a row at the top! This is wrong. Your import is fine. Try:

import java.util.Scanner;
public class ScannerDemo {
  public static void main(String[] args) {
    ...
  }
}

Answer 2

Your class definition is wrong. You are trying to define two classes, ScannerDemo and Main . Replace:

class ScannerDemo
 public class Main

With just:

public class ScannerDemo

Also, in your main method, you should be referring to the userName variable, instead of username , and you are not defining username2 . Note that Java identifiers are case sensitive:

public static void main (String [] args)
{
  Scanner sc = new Scanner(System.in);
  System.out.println("Enter a number");
  String userName = sc.nextLine();
  System.out.println("your number is" + username + "enter your next number");
  String username2 = sc.nextline();
  System.out.println("your total is" + username2 );
}

Answer 3

import java.util.Scanner;

public class ScannerDemo {

    public static void main (String [] args)
    {
        Scanner sc = new Scanner(System.in);
        String userName;

        System.out.println("Enter a number");
        username = sc.nextLine();
        System.out.println("your number is" + username + "enter your next number");
        username2 = sc.nextline();
        System.out.println("your total is" + username2 );     
    }
}

Answer 4

 import java.util.Scanner;

 public class ScannerDemo {

      public static void main (String [] args) {

         Scanner sc = new Scanner(System.in);
         String userName;

         System.out.println("Enter a number");
         int userName = sc.nextInt();
         System.out.println("your number is " + userName);
         System.out.println("enter your next number");
         int userName2 = sc.nextInt();
         System.out.println("your total is " + (userName2 + userName));     
     }
 }

Hope this helps

Answer 5

import java.util.Scanner;


public class ScannerDemo {

public static void main (String [] args) {

        Scanner sc = new Scanner(System.in);
        String userName;

        System.out.println("Enter a number");
        int username = sc.nextInt();
        System.out.println("your number is " + username);
        System.out.println("enter your next number");
        int username2 = sc.nextInt();
        System.out.println("your total is " + (username2 + username));     
    }
}