one error in Java code Please help?

Hi everyone

I am writing this code that uses an input box that has three choices and I am having trouble parsing the value afterward :

import java.io.*;

import javax.swing.JOptionPane;

public class MyType

{

public static void main (String[] args)

{

// Declare and Construct Variables

String strChoice, strTryString, strTryInt, strTryDouble;

int choice, tryInt;

double tryDouble;

boolean done = false;

//loop while user does not click cancel button

while(!done)

{

try

{

String message = "What is My Type?" +

"\n\n1) String\n2) Integer\n3) double\n4) Quit the program\n\n";

choice = Integer.parseInt(strChoice);

switch(choice)

{

case 1:

JOptionPane.showMessageDialog(null, "Correct, any input can be saved as a String");

break;

case 2:

JOptionPane.showMessageDialog(null, "Correct");

tryInt = Integer.parseInt(strChoice);

break;

case 3:

JOptionPane.showMessageDialog(null, "Correct");

tryDouble = Integer.parseInt(strChoice);

break;

case 4:

JOptionPane.showMessageDialog(null, "Exit.");

done = true;

break;

default:

throw new NumberFormatException();

}

}

catch(NumberFormatException e)

{

JOptionPane.showMessageDialog(null,"Please try again");

}

}

}

}

Thank You :-)