Definition “JavaBean” What are JavaBeans?
JavaBeans are software components for the Java programming language. They are reusable and designed to easily transfer GUI classes. They are now also used for data transfer via containers.
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JavaBeans are reusable and mostly lightweight software components that are used within Java.
A JavaBean is a software component with which graphical user interfaces can be created (“instantiated”) and transmitted. In fact, it works as a standard within the Java programming language. This means that it is reusable – it is a generally working supplement that simply needs to be used.
Ideally, there is no need to write a line of code for customization. The JavaBean supports RMI (Remote Method Invocation), i.e. calling remote methods. Therefore, it is also suitable for transferring data via containers. It provides the necessary structure for this.
How a JavaBean works: a simple example
Java is an object-oriented programming language. This means that the architecture of the software consists of objects that are oriented to the section of reality that the program affects. The term is somewhat misunderstood: objects can also include” functions “or” methods”. It is also possible to change the state of the objects by means of “procedures”. They don’t have to be rigid entities.
Hence the need for development to tailor objects individually. For example, Java is used for web development, for desktop applications and for smartphone applications. It goes without saying that different qualities are in demand here. Problematically, however, there is also the need to be visually and functionally identical to the outside.
As an example: An online shop wants to design a login area. This should look and work on the web just like an app. In addition, the data entered via the mobile phone for registration should also work on the web – and vice versa. At this point, the JavaBean intervenes – as a standardized software component, it makes it possible to design the forms uniformly and to enable data transmission.
For this, it has the following properties:
- public parameterless constructor (i.e. the JavaBean can be used to create objects, but it is not specified exactly how this must be done)
- Public Getters (public query possible)
- Public Setters (public changes possible)
- Serializability (figure in series to make it easier to identify the JavaBeans and their jobs)
- Reusability through inheritance (the new” bean ” seamlessly takes over the tasks from the one it replaces)