JavaBeans bring a component model to Java so that you can create and then string together reusable components to build rich applications with relatively little programming. JavaBeans for Dummies explains JavaBeans and how they work in a way that doesn't presume any knowledge of Java or, really, any significant knowledge of programming. Thus the book is especially well suited for someone who wants to learn how to use JavaBeans without delving into the intricacies of Java programming itself. While it superficially covers crucial topics such as introspection, event handling, and persistence, serious programmers may want further depth.
With this one and Java for Dummies, I don't bother glancing at another technical "for Dummies" book ever again, barring HTML. This book is more like "Javascripting for Dummies". The author does an extremely poor job of setting a context and overview - it's straight into the code and syntax. Since I know Java, it wasn't difficult to follow. For people who knows only HTML, this book will leave them in a fog. Want to learn Javascript? Look elsewhere.