Help with while statement

[indianj]

Hello friends,

I am new to Java. I want to create a application that keep asking question untill user exit the question. should be very simple. i do not know how to make a loop that will do it. if anyone can help, i will be very thankful.

Thanks
indianj

Here is my code:

 
  import javax.swing.*;
import java.util.Scanner;

public class HW2part2 {

    public static void main (String [] args){
    	String sex;
    	String father;
    	String mother;
    	
    	int  mfSex;
    	int Hfather;
    	int Hmother;
    	
    	
    	JOptionPane.showMessageDialog(null,":: Health Care Center ::","..: Welcome to Hadik's Movie Place :..",JOptionPane.INFORMATION_MESSAGE);
    	  
    	sex = JOptionPane.showInputDialog("Enter Sex of Child\n1. Male\n2. Female");
    	mfSex = Integer.parseInt(sex);  
    		
 		father = JOptionPane.showInputDialog("Enter the Height of the father");
    	Hfather = Integer.parseInt(father); 
			 
   	 	mother = JOptionPane.showInputDialog("Enter the Height of the mother");
   		Hmother = Integer.parseInt(mother);  
    			 
    	boolean  nogender;	 
    		 do
    		 	{
    		 	
      	 	if (mfSex == 1){
 	 	
    	 			
	    		int Hmale_child = ((Hmother * 13/12)+ Hfather)/2;
	   	 	 	double Hmale_childFeet = Hmale_child * 0.0833;
	   	 	 	
	    	 	System.out.println("Childs height is " + Hmale_child + " inches and " + Hmale_childFeet + " feet");
	    	 	JOptionPane.showMessageDialog(null,"Male Child's Height is: "+Hmale_child+" Inch and "+Hmale_childFeet+"Feet","..: Welcome to Hadik's Movie Place :..",JOptionPane.INFORMATION_MESSAGE);
				
				System.exit (0);
    	 	}
    	 	
    	 	if (mfSex == 2){

    			int Hfemale_child = ((Hfather * 12/13)+ Hmother)/2;
   	
    	 	 	double Hfemale_childFeet = Hfemale_child * 0.0833;
    	 	 	JOptionPane.showMessageDialog(null,"female Child's Height is: "+Hfemale_child+" Inch and "+Hfemale_childFeet+"Feet","..: Welcome to Hadik's Movie Place :..",JOptionPane.INFORMATION_MESSAGE);
    	 	 
 				break;
    	 	}
    	 	
    	 	else{
    	 		nogender=true;
    	 		
    //	 	System.out.println("insterted the wrong number");	
    	 	}
    		 
    	 }
    	 while (nogender);
    	 
    }
    
    
}

[ComputerJy]

I don't think I really get your question but if you want to exit when the user presses the "Cancel" button, you can do something like:

        if (sex == null) {
            JOptionPane.showMessageDialog(null, "Bye bye");
            System.exit(0);
        }