Painting 2 Components From Different Classes

I want to make a simple Table Tennis game. I have 2 drawing classes. 1st should draw oval and 2nd rectangle. But second class, which should draw rectangle doesn't work and if i use it together with oval class, then oval doesn't appear too.

Java Code:

public static void main(String[] args) throws InterruptedException
{
Intro i = new Intro();
Pall pall = new Pall();
Laud laud = new Laud();
i.frameID().add(pall); // this adds oval
i.frameID().add(laud); // this adds rectangle
i.frameID().pack();
i.frameID().setSize(400, 400);

[code]...