Killer Game Programming in Java - An online book that can also be bought in the stores.
Java 3D API Tutorial - Sun's PDFs for creating 3D graphics.
Java 2D Graphics - Sun's tutorial trail for creating 2D Graphics.
2D Text Tutorial - Sun's tutorial on using the Java 2D Text APIs.
Free Programming and Computer Science Books - Many in PDF form.
BufferedImage in Java - How to create and use a BufferedImage in Java
Java Buffered Analog Clock - Example of usinga buffered image to make an analog clock