Help how to Call a New Form

Question

Anyone there that can help me how to call a new form...
Actually I have 3 forms.... the Parent, and 2 child...
child a
child b
I extend JFrame to the Parent...
I extend JDialog to the child....
I want to know how to call child a by the child b.....
this is my code in calling them....
when i'm in the form_b, i used this code to show form_a....
form_a a = new form_a();
a.setVisible(true);
when i'm in the form_a, i used this code to show form_b....
form_b b = new form_b();
b.setVisible(true);
but the problem is when i call either of the two, there's always a new form for form_a and also for form_b....
I want to call the form without opening a new form... that form also will be visible... is there anyways i can do this.... any help will do.... tenks....

Answer 1

One way would be to have the parent maintain instances of A & B and have public methods for accessing A & B. Something like this. You would have to pass a reference to the parent class to A & B so that they can call the access methods.
public class form_a extends JDialog{
   public form_a (Parent parent){
public class Parent extends JFrame{
   form_a a;
   form_b b;
   public Parent(){
      a = new form_a (this);
      b = new form_b (this);
   public form_a getFormA(){
        return form_a;
   public form_b getFormB(){
       return form_b;
}