Because the book is older (published around 2005 for the 3rd edition), it has entered a grey area regarding digital distribution. However, here are legitimate ways to access it:
Physical copies of this book are rare and expensive (often $70+ used). A offers: the definitive guide to java swing pdf
A definitive guide must explain that Swing is built on top of the Abstract Window Toolkit (AWT). Unlike AWT, which uses the operating system's native components (heavyweight), Swing components are "lightweight"—they are painted entirely in Java code. Because the book is older (published around 2005