I'm having troubles with my JMenuItems and Jframe. I want that when you click on a JMenuItem the previous JPanel dissapears and the one you clicked for at the JMenuItem will appear. Now, I don't really know how to accomplish this.
Someone said to me I should use the observer design pattern, but I don't know if this will work or not. I did read about the observer pattern and understand what is about. So can this pattern solve my pattern? And how?