Need help with switch/case

Question

Thanks in advance.
I read the tut on switch statements. My assignment is asking me to do something that is not detailed in that explanation ;
I have a total of 5 case statements, 1-4 and a default statement. The instructions for them are as follows:
Case 1: If the user enters a 1, display a message that informs users they are correct, as any input canbe saved as a String. Enter the break statement.
Case 2: If the user enters a 2, parse the value into tryInt. Display as message that informs the users they are correct. Enter the break statement.
Case 3. If they user enters a 3, parse the value into tryDouble. Display a message tha t informs users they are correct. Enter the break statement.
Case 4: Set done equal to true. Enter code to display a closing message. Enter a break statement.
Case default: throw a new NumberFormatException.;
Here is the code
import java.io.*;
import javax.swing.JOptionPane.*;
public class MyType1
     public static void main(String[] args)
          //declaring variables
          String strChoice, strTryString, strTryInt, strTryDouble;
          int choice, tryInt;
          double tryDouble;
          boolean done = false;
          //loop while not done
          while (!done)
               try
                    choice = Integer.parseInt(strChoice);
                    switch(choice)
                         case 1:
                              JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 2:
                              choice = Integer.parseInt(tryInt); JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 3:
                              choice = Double.parseDouble(tryDouble);
                              JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 4:
                              done = true; JOptionPane.showMessageDialog(null,"Goodbye!");
                              break;
As usual Im doing something wrong. Please help.

Answer 1

Thanks for your input. The directions for the assignment tells me to first declare the variables.
Begin a while(!done) loop to repeat as long as teh user does not click the Cancel button.
Inside a try statement, enter code to display an input box with three choices.
Type choice = Integer.parseInt(strChoice); on the next line to parse the value for the choice entered by the user.
(HERE THE SWITCH STATEMENT WITH CAST STATEMENTS)
Close the switch statement with brackets
Create a catch statement.
import java.io.*;
import javax.swing.JOptionPane.*;
public class MyType1
     public static void main(String[] args)
          //declaring variables
          String strChoice, strTryString, strTryInt, strTryDouble;
          int choice, tryInt;
          double tryDouble;
          boolean done = false;
          //loop while not done
          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);
                    //test for valid choice 1, 2, 3, or 4
                    if (choice<1 || choice>4) throw new NumberFormatException();
                    else done = true;
                    switch(choice)
                         case 1:
                              JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 2:
                              choice = Integer.parseInt(tryInt); JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 3:
                              choice = Double.parseDouble(tryDouble);
                              JOptionPane.showMessageDialog(null,"You are correct!");
                              break;
                         case 4:
                              done = true; JOptionPane.showMessageDialog(null,"Goodbye!");
                              break;
               catch (NumberFormat Exception e)
                    JOptionPane.showMessageDialog(null, "Please enter a 1, 2, 3 or 4:",  "Error", JOptionPane.INFORMATION_MESSAGE);
          }Typing this now, I see I dont have anything in my try statement entering code to display an input box with three choices.
(PS. I know I would write a catch statement for the NumberFormatException, but why would I also write this exception in the case statement also??)