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JavaBeans defines a powerful and simple component model for Java. The goal of JavaBeans is to provide reusable and self-sufficient units that developers can manipulate programmatically or that construction tools can manipulate visually.
JavaBeans can be graphical user interface controls or they can have no visual representation. The graphical user interface controls in Java are typically JavaBeans so that the build tools can manipulate them. In J2EE, it is used from JSP, where they deliver a separation of the HTML presentation and Java code, confined in the JavaBeans.
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#JavaBean Properties: Other components can access the properties of a JavaBean. Typically, property corresponds to a private value that is accessed through the setter and getter methods, but it can also be a calculated value. Upgrading properties can lead to some side effects.
Assessors are methods of accessing properties. Assessors can be either getter or setter, and they follow the following naming conventions:
Void set Property_name (Property_type value); // setter
Property_type get Property_name () // getter
For a Boolean property, a getter method could be: - Boolean is Property_name () // getter for a Boolean property.
#Events and notification: Events are a feature of JavaBeans that allow independently developed components to communicate with each other by propagating information about their state. In this model, some components trigger events, which other components handle, playing the role of event listeners.
To support this communication model, the JavaBeans component model provides:
#Callback Methods: Every bean implements a subtype of the Enterprise Bean interface that defines various methods, known as callback methods. Each of these methods alerts the bean about a different event in its life cycle and the container will call these methods to notify the bean when it is going to activate it, persist its state to the database, end the transaction, delete the bean memory, etc.
#EJBContext: Every single bean gets an EJBContext object, which is a straight reference to its container. The EJBContext interface offers procedures to interact with the container so that the bean can request data about its environment, for instance, the identification of its customers, the status of a transaction, or to obtain remote allusions to itself.
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