Abstract: Java2 Swing standard components to meet the general needs of the desktop program, but the actual projects will encounter needs of some special components, these special components are often a combination of standard components or features of the rewrite. First, this article describes the architecture of Swing components, then analyzes each of the Swing components of the composition of the object, gives the standard components of the expansion of the steps and multistage pull-down menu to realize the key to the code at last.

Key words: Java2 Swing component, pull-down menu