The Java Class Libraries are the building blocks of the Java ProgrammingLanguage. There are thousands of public Java Class Libraries and over 100packages in J2SE 5.0. Often, it is difficult for programmers to remember themost useful classes and packages. The poster shows how the most usefulclasses are related and provides programmers with an easy-to-use quickreference. This is a unique product that can only come from Java guru PatrickChan. Every year we give away 1,000 posters to JavaOne attendees. Theseattendees then put the posters up in their offices and become the envy of alltheir co-workers and create further demand for this ultimate tool.