what does frame.setLayout(null)do?(frame is a JFrame)

Question

I have seen this in a slide but I couldn't get that when and why we use this?

Answer 1

null layout means absolute positioning - you have to do all the work in your code. No layout manager to help you out.

Answer 2

Why don't you start by reading the Swing tutorial? There is a section that explains all about Layout Management as well as well what "absolute positioning" is. It also explains when you would use abolute positioning versus using a layout manager.

Generally the only time you would use it is when you need to support drag components to a random position.

The tutorial also has lots of other basic examples of using Swing components.