In this article, an excerpt from The Definitive Guide to Java Swing (Apress, June 2005; ISBN: 1590594479), John Zukowski explains how to work with the JSpinnercomponent.

So I've got my JFrame, and it contains an OpenGL canvas, which has to be set and resized based on pixel dimensions. I'd like to be able to resize the whole window, but I need to know the ...

For new Java programmers, the JOptionPane class is a great visual and user-friendly introduction to user input and Swing-based programming. Here's how to get started.