Compiles Fine, but Does Not Execute

Question

I'm using jdk 1.3.1 since that is what my school uses.
This program is really simple, the user is supposed to pick a type of variable then put data that is valid for that data type, and if they're wrong the catch numberformatexception would tell them. I've looked at the code for awhile, its not the best but I dont see why it doesn't run maybe someone could scan through the code and see if something stands out. I know its annoying when someone posts their entire programs code but since I have no idea where my problem is help would be most appreciated.
* In The Lab 1
* Using switch and try Blocks
* Programmed by: Andy Kovacs
import java.io.*;
public class InTheLab
    public static void main(String[] args) throws IOException
        BufferedReader dataIn = new BufferedReader(new InputStreamReader(System.in));
        //Variables
        String strChoice;
        int intChoice;
        String strString;
        String strInteger;
        String strDouble;
        double dblDouble;
        int intInteger;
        boolean done = false;
        //Loop so program doesn't end before user is finished
        while(!done)
            try
                strChoice = dataIn.readLine();
                intChoice = Integer.parseInt(strChoice);
                //Makes sure the user selects 1-4
                if (intChoice >= 5 || intChoice <=0)
                    System.out.println("Invalid Selection");
                    throw new NumberFormatException();
                System.out.println("What's My Type?");
                System.out.println("");
                System.out.println("1) String");
                System.out.println("2) Int");
                System.out.println("3) Double");
                System.out.println("4) Quit the program");
                String strHeader;
                switch(intChoice)
                    case 1:
                        System.out.println("Insert Data That Would Be Valid For String Data");
                        strString = dataIn.readLine();
                        System.out.println("Your are correct, as any input can be saved as a string.");
                        break;
                    case 2:
                        System.out.println("Insert Data That Would Be Valid For Integer Data");
                        strInteger = dataIn.readLine();
                        intInteger = Integer.parseInt(strInteger);
                        System.out.println("You are correct, as Integers are any whole numbers.");
                        break;
                    case 3:
                        System.out.println("Insert Data That Would Be Valid For Double Data");
                        strDouble = dataIn.readLine();
                        dblDouble = Double.parseDouble(strDouble);
                        System.out.println("You are correct, any number up to 14 or 15 decimal places are valid for Double Data");
                        break;
                    case 4:
                        done = true;
                        System.out.println("Closing program");
                        break;
                    default:
                        throw new NumberFormatException();
            catch (NumberFormatException e)
            System.out.println("Your Response was not a valid number or answer.");
            System.out.println("Please reenter your selection.");
}

Answer 1

I am using version 1.4, and your code executes on my
machine.
What happens when you try it on your machine? An
exception?
Nothing? You might get rid of the "throws
IOException"
from main's signature and see if that helps... I seem
to
remember that the exception list was part of the
signature,
though I might be in error there.It isn't. There is nothing wrong with have exception specification on the main method.