Answered: What is java bean? What are the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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What is java bean? What are the necessary criteria of bean class? How many types of properties are in java bean? Discuss about them.

Expert Solution

Step 1

Any Normal Java class needs to follow some constraint to become a Java Bean class.

These constraints are: -

RULE 1: All data members defined in class must be private and can only be accessed or modified using getter and setter method.

These data members can only accessed or modified using methods provided by the Class.
The name of methods for accessing the values are getters and method which allow modifications in private data members of class are called setters.
The setter and getter method name must be followed by data member also called properties of class.
Example: if data member is name.
Then setter method name is setName, while the getter method name is getName().
Any random name can't be used for accessing or modifying those fields.

RULE 2: - The class must have a default constructor also 0-argument constructor.

For every class in java the compiler provides one default constructor if any constructor is not explicitly defined in the class. This constructor is called no-arg constructor.
It is must to have a default constructor (no-arg constructor) in the class either define explicitly or use the default constructor given by compiler.

RULE 3: - This class must implement the Serializable interface.

Serializable interface is used to store the objects, send them over the network or save it in disk or use the object in other processes.
Serializable interface does not have any method, It is mainly used a tagging or Marker interface.
Tagging interface means if the class implements the serializable interface the objects of the class can be stored, sent over the network or use in other processes as per requirement.

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