Need Help With Try, Catch -new Student

[redpayne]

I am in my first year of Java programming and I am having a hard time. I have been working on a small program and probably have more than one mistake. My instructor told me to check where the try clause ends. I have no idea.

I am new posting here so I am not sure if this will work. I hope you can copy and paste into a textpad file.
Please please help.
Thanks so much

 
 
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
                {
                JOptionPane.showInputDialog(null,"What's My Type?\n1)String\n2)integer\n3)double\n4Quit the program\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:
                    done = true;
                    JOptionPane.showMessageDialog(null, "Now Closing");
                    break;
 
                default:
                throw new NumberFormatException();
 
                }
 
        }
            }
        catch(NumberFormatException e);
                {
                JOptionPane.showMessageDialog(null, "Please try again");
                }
        }
 
 
 
        System.exit(0);
 
    }
 
}
 
 

[r035198x]

import javax.swing.JOptionPane;
 
public class MyType
{
 
    public static void main(String[] args)
    {
        // declare and construct variables
 
 
 
        int choice = 0;
        int tryInt = 0;
        double tryDouble;
        boolean done = false;
 
        // loop while user does not click cancel button
        while(!done) {
            try    {
                String strChoice = JOptionPane.showInputDialog(null,"What's My Type?\n1)String\n2)integer\n3)double\n4Quit the program\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:
                        done = true;
                        JOptionPane.showMessageDialog(null, "Now Closing");
                        break;
                    default:
                        throw new NumberFormatException();
 
                }
            }
            catch(NumberFormatException e) {
                JOptionPane.showMessageDialog(null, "Please try again");
            }
        }
 
        System.exit(0);
 
    }
 
}

Is there anything else that you wanted the program to do?

[redpayne]

No, but I still can't get it to compile. It says class or interface expected. I appreciate your help. This stuff is so hard for me.
Thanks,
Kendra

[r035198x]

No, but I still can't get it to compile. It says class or interface expected. I appreciate your help. This stuff is so hard for me.
Thanks,
Kendra

Make sure there are no unintentional characters (dots, commas etc in your code). It does not give an error here

[redpayne]

Ahh, There was a colon at the top. Thanks, In my instructions in the book, it tells me begin a while loop to repeat as long as the user does not hit the cancel button but does not tell how to end if they do. Would that be an action listener? It said to import the io package and I noticed you took it out. I didn't know why it said to import that either.

[r035198x]

Ahh, There was a colon at the top. Thanks, In my instructions in the book, it tells me begin a while loop to repeat as long as the user does not hit the cancel button but does not tell how to end if they do. Would that be an action listener? It said to import the io package and I noticed you took it out. I didn't know why it said to import that either.

To make the program exit if the user clicks cancel, add this

String strChoice = JOptionPane.showInputDialog(null,"What's My Type?\n1)String\n2)integer\n3)double\n4Quit the program\n");
        if(strChoice == null) {
            strChoice = ""+4;
        }

If cancel is pressed, strChoice will be null, so set it to the exit option. The io thing is the reason I asked if you wanted to do something else because as you can see package io has nothing to do with this.