Adding JPanel from another class to JPanel in JFrame

Question

I can\'t get my JFrame from main class to display JPanel from another class. Everything compiles without errors.

JFrameTest.java:

pa         


        

Answer 1

The problem comes from the JPanelOne class. It inherits JPanel but in the constructor, you create a new JPanel and then you add a button to it. If you do this instead:

public class JPanelOne extends JPanel {

   public JPanelOne() {
       JButton button = new JButton("test");
       add(button);
   }
}

it should work as you expect it.