JavaBeans is a portable, platform-agnostic model written in the Java programming language. The components that make it up are beans.
To put it another way, JavaBeans are classes that encapsulate several objects into a single object. It allows users to access these items from a number of locations. JavaBeans include constructors, getter/setter methods, and other functionality.
There are a couple of JavaBeans conventions to follow:
- A default constructor should be available for beans (no arguments).
- Beans should include getter and setter methods.
- A getter method is use to read the value of a readable property.
- To update the value, a setter method should be use.
Because it allows you to save, store, and restore the state of the JavaBean you’re working with, JavaBeans should implement java.io.serializable.
A JavaBean is a Java class that must meet the rules below:
- It needs a function Object() { [native code] } that doesn’t take any arguments.
- This must be serializable.
- It should have getter and setter methods for changing and retrieving property values.
Advantages of JavaBeans
The following are some of the advantages of Java Beans:-
- Portable: JavaBeans are portable because they are totally written in Java and can execute on any platform that supports the Java Run-Time Environment. All platform-specific functionality, as well as JavaBeans support, are implemented by the Java Virtual Machine.
- Compact and Easy: Components created with JavaBeans are small and simple to design and utilize. Furthermore, This is emphasized heavily in the JavaBeans architecture. It is not difficult to write a basic Bean. A bean also does not need to carry a lot of inherited baggage to sustain its habitat because it is light.
- Contains the Java Platform’s Strengths: In JavaBeans, there is no new complex process for registering components with the run-time system, hence it is quite compatible.
- The JavaBean attributes and methods can be access through another programme.
- It makes it a lot easier to reuse software components.
Properties
A JavaBean property is a named feature of an object that may be access through the object’s user. Any Java data type can be used as a feature, but it must include the classes you specify.
A JavaBean property can be read-only, read-write, or write-only. JavaBean features are access via two methods in the implementation class of the JavaBean:
- getPropertyName ()
For example, if the property is called firstName, the method to read it is called getFirstName(). The accessor is the name for this procedure.
- setPropertyName ()
For example, if the property name is firstName, the method to write that value is setFirstName(). The mutator is the name of this approach.