Set the JPanel size to fill parent with little margin

Question

I have two Jpanel (JpanelLeft and JpanelLeftContent) how can i make the JpanelLeftContent fill parent size with a little margin on the lef

Answer 1

To make a JPanel appear rounded, you need to make your own class that extends JPanel, override paintComponent and draw the panel as an ellipse Javadoc here This will create a customized object which is an JPanel.

When you specify the size of your ellipse, you want to get the Y and X values from the parent panel (since you will be adding your ellipse ontop of another panel) and then subtract the number of pixels you desire from the X-axis. This could be achived by passing those values to the "ellipse panel" constructor.