Java is an object-oriented programming language. Components are simple encapsulations of data and methods. In short, components are objects. JavaBean is a Java class (component) that follows a specific writing method. Let’s learn about it with the editor
What is a component
My personal understanding is that components are to achieve a certain function The integrated collection of methods and data also contains some description information in order to describe the characteristics of the component, such as the name or ID of the component, which interfaces are provided, version information, etc. Typically components are provided as binaries, but they can also be provided as source code, although this is rarely the case.
Understand the relationship between components, classes, and objects
1. The relationship between components and classes
Components can be understood as the super of classes Set, which may contain several classes, or of course only one class; in addition, components often need to provide some additional description information for the component manager to manage, and classes lack this information. A class plus this necessary information is basically equivalent to a component. However, usually components are released in binary form, while classes are at the source code level.
2. The relationship between components and objects
Components are static code and data, while objects are dynamically created entities. The relationship between the two is a bit like class and object.
What is a JavaBean component
In computing based on the Java platform, a JavaBean component is a class that encapsulates many objects into a single object (bean).
They are serializable, have zero-argument constructors, and allow properties to be accessed using getter and setter methods. The name "Bean" encompasses this standard, designed to create reusable software components for Java.
It is a reusable software component written in Java that can be operated visually in the application builder tool.
It usually has the following characteristics:
This Java class must have a no-parameter constructor. The properties must be private.
Private attributes must be exposed to other programs through public type methods, and the naming of methods must also comply with certain naming conventions.
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