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This article mainly explains "what is the usage scenario of Javabean". Friends who are interested may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what is the use scene of Javabean"?

Introduction

JavaBean is a reusable component of Java and a special Java class, which is written in Java language and complies with the specification of JavaBean API. In order to write JavaBean, the class must be concrete and public, and have no parameter constructor. JavaBean exposes member properties of the internal domain by providing public methods that conform to consistent design patterns, which are obtained by the set and get methods.

The difference between JavaBean and normal Java classes:

1. Provides a default no-parameter constructor

two。 There are a series of read-write properties

3. There is a series of getter or setter methods

4. Needs to be serialized and implements the Serializable interface

JavaBean example:

Such as student entities (StudentsBean.java)

Public class StudentsBean implements java.io.Serializable {

Private String firstName = null

Private String lastName = null

Private int age = 0

Public StudentsBean () {

}

Public String getFirstName () {

Return firstName

}

Public String getLastName () {

Return lastName

}

Public int getAge () {

Return age

}

Public void setFirstName (String firstName) {

This.firstName = firstName

}

Public void setLastName (String lastName) {

This.lastName = lastName

}

Public void setAge (int age) {

This.age = age

}

}

Application scenario

1. Build some common widgets, such as JDBC connection pooling, application monitoring, user counting, and other classes that participate in user behavior

two。 Reusable and need unified maintenance, such as common entity classes

Matters needing attention in designing JavaBean

1. Full portability

two。 Compact and easy to create and use

3. Reusable and easy to maintain

At this point, I believe you have a deeper understanding of "what is the use scenario of Javabean". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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