Can someone tell me why I can run this program in JCreator with no problems, but when I run it with the Command prompt it throws a java.util.InputMismatchException if I input anything?

import java.util.Scanner;
 
public class tester {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in).useDelimiter("\n");
        System.out.println("Type either 1 or 2");
        int temp = in.nextInt();
        System.out.println("");
        if (temp == 1)
        	System.out.println("you typed 1");
        if (temp == 2)
        	System.out.println("you typed 2");
        else
        	System.out.println("you typed something else!");
    }
}

 

 

Why are you explicitly specifying the new line character as the delimiter? Try running it without that...

 

 

Try this code it is running correctly on command prompt

import java.util.Scanner;
 
public class tester {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Type either 1 or 2");
        int temp = in.nextInt();
        System.out.println("");
        if (temp == 1)
        	System.out.println("you typed 1");
        if (temp == 2)
        	System.out.println("you typed 2");
        else
        	System.out.println("you typed something else!");
    }
}

 

 

I need the delimiter because it is an essential part to the actual program. Mostly I'm just wondering why it runs with JCreator but throws an error in the command prompt.

 

 

It's giving you that exception because from a Windows console, a newline is "\r\n". Because the scanner encounters the "\n", and you've explicitly set that as the delimiter, it thinks that "\r" must be part of the first token, and so it tries to parse it as part of an integer when clearly it's not. JCreator must send just "\n" to stdin when you press Enter.

If you just leave the Scanner at the default delimiter, it will correctly handle both "\n" and "\r\n" as newlines.

 

 

Thanks that helps a ton.

 

 

Easy fix keeping the "\n" delimiter:

Scanner in = new Scanner(System.in).useDelimiter("\n|\r\n");