Drawing rectangles on a JPanel

Question

I have a JScrollPane and on top of it I have a JPanel named \'panel1\'. I want some rectangles to be drawn on this JPanel.

I have a class named DrawRectPanel which e

Answer 1

instead of adding

contentPane.add(new DrawRectPanel());

you should do

contentPane.add(panel1);

Because you already have new DrawRectPanel in panel1. But in your code you are adding another instance of DrawRectPanel in contentPane. And never added panel1 in none of your container.