Message box won't show up

[Aer crp]

Hi,
I am trying to teach myself Java and have just started to use message boxes to get input.
However the message boxes won't show upp unless i place them first in the code:

package objects;

import java.util.Scanner;
import static java.lang.System.out;
import javax.swing.AbstractAction.*;
import javax.swing.JOptionPane;

public class Objects {


    public static void main(String[] args) {
    
    Scanner MyScanner = new Scanner(System.in);
    double amount, total;
    boolean IsTaxable = false;
    int bc = JOptionPane.YES_NO_OPTION;
    int mc = JOptionPane.QUESTION_MESSAGE;
        
    out.print("Amount: ");
    amount = MyScanner.nextDouble();
   
    int ch = JOptionPane.showConfirmDialog(null, 
       "Taxable?", "Title", bc, mc);
    if (ch == JOptionPane.YES_OPTION){
         IsTaxable = true;
        }
        else if (ch == JOptionPane.NO_OPTION){
            IsTaxable = false;
        }
    
    if (IsTaxable == true){
        total = amount * 1.05;
    } 
    else{
        total = amount;
    }
    out.println(total);
    }
}

I dont know why it wont work unless i place the box first

[Paul Clapham]

I don't understand what you mean by "place the box first". How about if you post your original code and describe your problem in a little more detail?

[Aer crp]

Hi,
Sorry for the slow reply. What i mean is that if i write

package objects;   
  
import java.util.Scanner;   
import static java.lang.System.out;   
import javax.swing.AbstractAction.*;   
import javax.swing.JOptionPane;   
  
public class Objects {   
  
  
    public static void main(String[] args) {   
       
    Scanner MyScanner = new Scanner(System.in);   
    double amount, total;   
    boolean IsTaxable = false;   
    int bc = JOptionPane.YES_NO_OPTION;   
    int mc = JOptionPane.QUESTION_MESSAGE;   
  
    int ch = JOptionPane.showConfirmDialog(null,    
       "Taxable?", "Title", bc, mc);   
    if (ch == JOptionPane.YES_OPTION){   
         IsTaxable = true;   
        }   
        else if (ch == JOptionPane.NO_OPTION){   
            IsTaxable = false;   
        }  
         
    out.print("Amount: ");   
    amount = MyScanner.nextDouble();   
            
    if (IsTaxable == true){   
        total = amount * 1.05;   
    }    
    else{   
        total = amount;   
    }   
    out.println(total);   
    }   
}

the message box will be displayed but if

    int ch = JOptionPane.showConfirmDialog(null,    
       "Taxable?", "Title", bc, mc);   
    if (ch == JOptionPane.YES_OPTION){   
         IsTaxable = true;   
        }   
        else if (ch == JOptionPane.NO_OPTION){   
            IsTaxable = false;   
        }  

is not the first thing that is executed then the program runs fine up until it encounters the message box function (statement? Sorry dont really know the linquo yet ).
It doesn't matter where i place the code for the message box, it won't work unless it is first in the code.

[Jesper de Jong]

Aer crp wrote:is not the first thing that is executed then the program runs fine up until it encounters the message box function

So, what happens if you place it somewhere else? Do you get an error message? Where would you for example want to place the code, if you're not placing it as the first thing?