Java SE (Java Platform, Standard Edition)

Hi,

I am not able to use panels that implement interfaces to realize a composition with other panels.

I would like to do this composition to decide at run time (using a method factory pattern) how the panels have to be arranged.

The the code is this...:

public ClassDialog extends JFrame {
Interface_one panel1 ;   
Interface_two panel2 ;  


public ClassDialog() {
    panel1 = new Panel1();
    panel2 = new Panel2();
    
    add(panel1);
    add(panel2)

}


public class Panel1 extends JPanel implements Interface_one{
..
}

public class Panel2 extends JPanel implements Interface_two{
..
}

When this code is wrote, the error: "no suitable method found for add" is showed in the IDE of NetBean..

I cannot understand what can be the reason because is not allowed to add component that implements interface..

So I would ask an explanation for the problem that I am having.

I should also get an advice how realize composition of panels using factory method pattern

thank you

regards

Angelo Moreschini