Scanner error message

Hey, I was making a program that uses the scanner class but I got a weird error. I narrowed the code down and I found the source, but I don't know how to fix it. I get the error when I try to run the program, compiling it gives me no error. My code:

Code:

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import java.util.Scanner;
public class UserInput {
        public static void main(String[] args) {
                Scanner myInput = new Scanner(System.in);
                int myNumber;
                myNumber = myInput.nextInt();
        }
}

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Error message:

Code:

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Exception in thread "main" java.util.NoSuchElementException
        at java.util.Scanner.throwFor(Scanner.java:838)
        at java.util.Scanner.next(Scanner.java:1461)
        at java.util.Scanner.nextInt(Scanner.java:2091)
        at java.util.Scanner.nextInt(Scanner.java:2050)
        at UserInput.main(UserInput.java:6)

Tool completed with exit code 1

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I am using TextPad 5.3.1 and this development kit:
Java SE Downloads - Sun Developer Network (SDN)


I'm new to Java so please try to keep the answers well explained.
Thanks for the help.

Quote:

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Originally Posted by plm-pusik

Hey, I was making a program that uses the scanner class but I got a weird error. I narrowed the code down and I found the source, but I don't know how to fix it. I get the error when I try to run the program, compiling it gives me no error. My code:

Code:

---

import java.util.Scanner;
public class UserInput {
        public static void main(String[] args) {
                Scanner myInput = new Scanner(System.in);
                int myNumber;
                myNumber = myInput.nextInt();
        }
}

---

Error message:

Code:

---

Exception in thread "main" java.util.NoSuchElementException
        at java.util.Scanner.throwFor(Scanner.java:838)
        at java.util.Scanner.next(Scanner.java:1461)
        at java.util.Scanner.nextInt(Scanner.java:2091)
        at java.util.Scanner.nextInt(Scanner.java:2050)
        at UserInput.main(UserInput.java:6)

Tool completed with exit code 1

---

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I get no such error when I compile and run your program.

Quote:

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I'm new to Java so please try to keep the answers well explained.
Thanks for the help.

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All the volunteers here strive to give the best answers that they can. If something isn't clear, then just ask.

Best of luck.

There must've been a non-digit (or not a minus sign) in the input buffer; the OP must've accidentally typed something.

kind regards,

Jos

Quote:

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Originally Posted by JosAH

There must've been a non-digit (or not a minus sign) in the input buffer; the OP must've accidentally typed something.

kind regards,

Jos

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OP?

When I try to run the program I don't even get to input anything ... it crashes before that.

What OS are you on?
How are you executing the program? From command prompt or from inside an IDE?

Quote:

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Originally Posted by plm-pusik

OP?

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It's an acronym: OP == Original Poster.

kind regards,

Jos

Quote:

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Originally Posted by Norm

What OS are you on?
How are you executing the program? From command prompt or from inside an IDE?

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I'm on Windows Vista Home Premium SP 2 (unfortunately).
I'm executing the program from an IDE (TextPad 5.3.1), using java.exe.

Though, I think I fixed it ... it looks like I didn't setup TextPad properly. I tried a few things but it wouldn't work so I changed to Eclipse and it now works fine. I did not reinstall JDK so I'm guessing that wasn't the problem. It would still be nice to know what the error message means though, so that I know what I'm dealing with if I get it in the future. Any ideas?

Quote:

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know what the error message means

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Have you looked at the API doc for the method you are using?

Here's a simple program that gets the error:

Code:

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      String input = "1 3";
      Scanner sc = new Scanner(input);
      while(true) {
        int x = sc.nextInt();
        System.out.println("x=" + x);
      }
/*
x=1
x=3
Exception in thread "main" java.util.NoSuchElementException
        at java.util.Scanner.throwFor(Scanner.java:838)
        at java.util.Scanner.next(Scanner.java:1461)
        at java.util.Scanner.nextInt(Scanner.java:2091)
        at java.util.Scanner.nextInt(Scanner.java:2050)
        at TestCode1.main(TestCode1.java:35)
*/

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