Clicking on a JPanel to draw shapes

Question

I have a JFrame containing 3 JPanels; Options, menu, canvas. In options there are a number of JButtons representing shapes. The aim is to click on the JButton of a shape e.g. re

Answer 1

I had to overwrite the canvas class' paint method; call super.paint in the canvas class and repaint each shape individually

public void paint(Graphics g){
            super.paint(g);
            for(int i=0;i