Thread: Jar Executable File

Will it even let it ...

Depends on the IDE.

Why is it even asking the user to, repeatedly too unfortunately, to enter the size of the grid? I never told it to do that in the exception, did I?

Enter a value that is an integer, i.e. not a decimal
java.util.InputMismatchException
Enter the size of the grid.

I knew it! You have a ghost that is changing your code when you turn your head.

InputMismatchException

You must enter the type of data that the program expects.
And the program MUST handle ANY user input.

Originally Posted by Norm

I knew it! You have a ghost that is changing your code when you turn your head.


You must enter the type of data that the program expects.
And the program MUST handle ANY user input.

It's not that it doesn't handle it, it's that it won't stop handling it.

Look at this code. Make a small test program and execute it. Enter chars vs digits sometimes.

      try {
        System.out.print("Enter an integer:");
        int x = s.nextInt();
        System.out.println("got x=" + x);
      }catch(InputMismatchException x) {
        System.out.println("error " + x);
        String ln = s.nextLine();   // remove the  invalid stuff
        System.out.println("ln=" + ln);
      }
      try {
        System.out.print("Enter another integer:");
        int x = s.nextInt();
        System.out.println("got x1=" + x);
      }catch(InputMismatchException x) {
        System.out.println("error1 " + x);
        String ln = s.nextLine();  // remove the  invalid stuff
        System.out.println("ln1=" + ln);
      }
   }

Originally Posted by Norm

Look at this code. Make a small test program and execute it. Enter chars vs digits sometimes.

      try {
        System.out.print("Enter an integer:");
        int x = s.nextInt();
        System.out.println("got x=" + x);
      }catch(InputMismatchException x) {
        System.out.println("error " + x);
        String ln = s.nextLine();   // remove the  invalid stuff
        System.out.println("ln=" + ln);
      }
      try {
        System.out.print("Enter another integer:");
        int x = s.nextInt();
        System.out.println("got x1=" + x);
      }catch(InputMismatchException x) {
        System.out.println("error1 " + x);
        String ln = s.nextLine();  // remove the  invalid stuff
        System.out.println("ln1=" + ln);
      }
   }

How will it know which x you're talking about?

int x = s.nextInt();

InputMismatchException x

System.out.println("error " + x);

Also, it will run exceptions, it just keeps going, i.e.

InputMismatchException
InputMismatchException
InputMismatchException
InputMismatchException
etc

It probably is because I'm having it do everything all over as I have the option to play again.

Unless, do you mean my stuff like this:

String ln = s.nextLine() should be removed?

Did you try my code in a program?

Not yet, but I figured out that it's only the Input Mismatch Exception that's causing the problem. The other two Eclipse claims are causing errors aren't. Actually, I see what you meant, though how come I didn't need to have console.nextLine for my two other exceptions?

Microsoft Windows [Version 6.0.6001]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.

C:\Users\Paul>java -jar battleship2.jar
Unable to access jarfile battleship2.jar

And now:

Microsoft Windows [Version 6.0.6001]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.

C:\Users\Paul\Documents>java -jar battleship game 2.jar
Unable to access jarfile battleship

C:\Users\Paul\Documents>java -jar battleship2.jar
Invalid or corrupt jarfile battleship2.jar

C:\Users\Paul\Documents>

Ok, code works now but still won't open. I told the desktop application to open with command prompt.

C:\Users\Paul\Documents>java -jar battleship2.jar
Invalid or corrupt jarfile battleship2.jar

The java program doesn't like your jar file.
Can you open it using a program that can read zip files and see if its corrupted?
If you can open it, look at the manifest file and see if it is formated correctly.

It may possibly be corrupted, but it does like it when I enter the name of the file in the command prompt or something like that, though it only shows the copyright.

I used Eclipse.

Can you open it using a program that can read zip files and see if its corrupted?
If you can open it, look at the manifest file and see if it is formated correctly.

Do you have a program that can open a zip file?

I might. Name some that will. Actually I do, but don't know their names.

On WinXP XP will open zip files. Rename the file by adding .zip to the end.

I have Vista.

Try it. No idea how vista works.

Anyway, is there way to make these jars so they can be sent to others more easily instead of running into a lot of technical errors sending them in email?

And is it possible to create a class that has one, undefined, JButton, or better, yet has an int in the constructor that determines the number of JButtons created, and a thing in the constructor to make a JScrollPane with a JTextArea and at least one JMenu that would create an int number of JMenuItems with another int number of submenuitems all in the constructor?

It will be class JComboPane.