What does bean mean in java?

The Chinese meaning of Bean is "bean". As the name suggests, JavaBean is a Java applet. JavaBean actually refers to a special Java class, which is usually used to implement some common simple functions and can be easily reused or inserted into other applications. All Java classes that follow certain programming principles can be called JavaBeans.

1. Overview of Java Bean technology

Java Bean is a Java-based component model, consisting of three parts: properties, methods and events. In this model, JavaBeans can be modified or combined with other components to generate new components or complete programs. It is a Java class that is encapsulated into an object that has a certain function or handles a certain business. Therefore, the Bean and its properties can also be accessed through Java code embedded within the JSP page.

The meaning of Bean is a reusable Java component. The so-called component is a group composed of one or several classes that can be managed internally by themselves, and the outside world does not understand its internal information and operation methods. Objects using it can only be manipulated through the interface.

2. Java Bean writing specifications

Java Bean is actually a Java class written according to the naming and design specifications of the Bean specified by the JavaBean technical standard. These classes follow an interface format to facilitate function naming, underlying behavior, and inherited or implemented behavior. Their biggest advantage is that code reusability can be achieved. Beans do not need to inherit a special base class (BaseClass) or implement a specific interface (Interface). Bean writing specifications enable the Bean container (Container) to analyze a Java class file and translate its methods (Methods) into properties (Properties), that is, use the Java class as a Bean class. Bean writing specifications include Bean class construction methods, defined properties and access method writing rules.

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