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In computing based on the Java Platform, JavaBeans is a technology developed by Sun Microsystems and released in 1996, as part of JDK 1.1.
The ‘beans’ of JavaBeans are classes that encapsulate one or more objects into a single standardized object (the bean). This in turn allows the beans to be treated as software components, and to be manipulated visually by editors and IDEs without needing any initial configuration, or to know any internal implementation details.
As part of the standardization, all beans must be serializable, have a zero-argument constructor, and allow access to properties using getter and setter methods.
- Introspection is a process of analyzing a Bean to determine its capabilities. This is an essential feature of the Java Beans specification because it allows another application, such as a design tool, to obtain information about a component.
- A property is a subset of a Bean’s state. The values assigned to the properties determine the behaviour and appearance of that component.
- A customizer can provide a step-by-step guide that the process must follow to use the component in a specific context.
- Beans may interact with the EventObject EventListener model.
- Persistence is the ability to save the current state of a Bean, including the values of a Bean’s properties and instance variables, to nonvolatile storage and to retrieve them at a later time.
- A bean should use accessor methods to encapsulate the properties. A bean can provide other methods for business logic not related to the access to the properties.
- The properties, events, and methods of a bean can be exposed to another application.
- A bean may register to receive events from other objects and can generate events that are sent to those other objects.
- Auxiliary software can be provided to help configure a bean.
- The configuration settings of a bean can be saved to persistent storage and restored.
- A class with a zero-argument constructor is subject to being instantiated in an invalid state. If such a class is instantiated manually by a developer (rather than automatically by some kind of framework), the developer might not realize that the class has been improperly instantiated. The compiler cannot detect such a problem, and even if it is documented, there is no guarantee that the developer will see the documentation.
- JavaBeans are inherently mutable and so lack the advantages offered by immutable objects.
- Having to create getters for every property and setters for many, most, or all of them can lead to an immense quantity of boilerplate code. This can be mitigated using tools like Lombok.
In order to function as a JavaBean class, an object class must obey certain conventions about method naming, construction, and behaviour. These conventions make it possible to have tools that can use, reuse, replace, and connect Java Beans.
The required conventions are as follows:
- The class must have a public default constructor (with no arguments). This allows easy instantiation within editing and activation frameworks.
- The class properties must be accessible using get, set, is (can be used for boolean properties instead of get), to and other methods (so-called accessor methods and mutator methods) according to a standard naming convention. This allows easy automated inspection and updating of bean state within frameworks, many of which include custom editors for various types of properties. Setters can have one or more arguments.
- The class should be serializable. (This allows applications and frameworks to reliably save, store, and restore the bean’s state in a manner independent of the VM and of the platform.)
Reusability is the major concept for any programming language. JavaBean is one such software component designed for reusability in a variety of environments. This tutorial on JavaBeans answers all your queries like What is Jave Beans Exactly, their Properties, Advantages of Using them, Disadvantages, etc. all in detail. By going through this guide you will be well versed on how to implement Java Beans by checking out the simple example program provided further.
Why we use JavaBeans?
- JavaBeans are reusable software components.
- Using JavaBeans rather than Java Scriptlets in your JSP page allows better separation of the view logic from the business logic.
How to Access the Java Beans Class?
In Order to Access the Java Beans Class, we use getter and setter methods.
Java Beans Properties
Java Bean Property is a named feature that users of the object can access. The feature can be any data type including the classes you define.
If the Property Name is Firstname then the Method Name would be getFirstName() to read the Employee Name. The method is known as Accessor. Properties of getter Methods are as such
- It should be Public in Nature.
- The return shouldn’t be void.
- It needs to be prefixed with the word get.
- getMethod shouldn’t take any argument.
If the Property Name is Firstname then the Method Name would be SetFirstName() in order to write the Employee Name. Properties of Setter Methods are as follows
- It should be public in nature.
- Return Type needs to be Void.
- Setter Method needs to be prefixed using the word Set.
- It should take Some Argument.
What are JavaBean Properties?
A JavaBean property can be accessed by the user of the object. The feature can be of any Java data type, containing the classes that you define. It may be of the following mode: read, write, read-only, or write-only. JavaBean features are accessed through two methods:
1. get Employee Name
For example, if the employee name is firstName, the method name would be getFirstName() to read that employee name. Properties of getter methods are as follows:
- Must be public in nature
- Return-type should not be void
- The getter method should be prefixed with the word get
- It should not take any argument
For example, if the employee name is firstName, the method name would be setFirstName() to write that employee name. Properties of setter methods:
- Must be public in nature
- Return-type should be void
- The setter method has to be prefixed with the word set
- It should take some argument
Now that you have attained some theoretical knowledge about JavaBeans, let us move on and understand the implementation process.
Advantages of JavaBeans
The following list enumerates some of the benefits of JavaBeans:
Compact and Easy
JavaBeans components are simple to create and easy to use. This is an important focus sector of the JavaBeans architecture. It doesn’t take much effort to write a simple Bean. Also, a bean is lightweight, so, it doesn’t have to carry around a lot of inherited baggage to support the Beans environment.
Carries the Strengths of the Java Platform
JavaBeans is pretty compatible, there isn’t any new complicated mechanism for registering components with the run-time system.
Though all these sound good, using JavaBeans presents some disadvantages as well. Now, let’s check out what those would be.
Disadvantages of JavaBeans
- JavaBeans are mutable, hence lack the advantages offered by immutable objects.
- JavaBeans will be in inconsistent state partway through its construction.
With this, we have reached the end of this “What is JavaBeans” article. I hope that the contents explained discussed here added value to your Java knowledge. Well, keep exploring the Java world. Stay tuned!
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Wait For Warm Weather
Beans grow best in warm soil so you should wait until the water is warm to plant them. Putting them in warmer soil will allow them to grow quickly and will give you a lot of beans in a short amount of time. You can plant the beans in cooler soil, but they will germinate more slowly.
If you live in an area with a short growing season, you may need to warm the soil artificially so you can give the beans a head start and time to grow before the season is over. This way you can harvest them in time.
Here’s a definition of beans in the Spring Framework documentation:
In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans.
Inversion of Control
Simply put, Inversion of Control (IoC) is a process in which an object defines its dependencies without creating them. This object delegates the job of constructing such dependencies to an IoC container.
Let’s start with the declaration of a couple of domain classes before diving into IoC.
Thank you for staying with this post “advantages of java beans” until the end.