What do Java Beans do

Java: How to Use Beans

The Java Beans model offers developers the opportunity to create software units that can be used as components or as well Beans are designated. Beans can serve as building blocks for composite components, applets, or larger applications. They are often used in integrated development environments (IDEs) and enable the graphical composition of components as well as the dynamic modification of object properties during runtime.

Beans are dynamic in that they can be changed and adjusted. The functions in the Properties window can be used in the design mode of a Java Beans Builder tool to configure the bean and then to save it by means of visual manipulation (persistent). Beans can be selected from a toolbox, placed in a shape and changed in appearance and behavior. You can define how you interact with other beans. It is also possible to link them with other beans to form an applet, an application or a new bean.

Beans serve different functions and purposes. They are used in the following areas, among others:

  • graphical user interfaces (GUIs)
  • "Invisible" beans, such as spell checkers
  • other types, such as applets

Java Beans Conventions

A Java Bean is nothing more than a Java class. The Java Beans API specification provides a simple naming convention for methods and fields, the use of which turns a Java class into a bean. The features of the bean, that is, its properties, methods and events, can be determined with an application that hooks into the bean. This can also be done with an IDE application such as IBM Eclipse or Intellij IDEA. Identifying the characteristics will Introspection called.

Beans support introspection in two ways:

  • They follow certain rules, called design patterns, for naming bean features. The class java.beans.Introspector examines beans for these design patterns to determine the features of the bean. The java.beans.IntrospectorClass uses the Core Reflection API.
  • Properties, methods and events are explicitly described by a separate information class (bean info class) that implements the bean info interface. A bean info class lists in detail all the features of a bean that are to be disclosed to the application builder tools.