Pojo Class in Java: How to Create?

Introduction

The term Plain Old Java Objects, or POJO, refers to Java objects that do not have any restrictions (for example, no requirement to implement Serializable interfaces, special access modifiers, etc.). It is also known as a free object.

There is no need for a special classpath for the POJO class in Java. Java POJO classes have gained popularity due to their readability and reusability in programs. Because POJO classes have no strict naming conventions, they are easier to read and write.

Java programs can use it since it does not adhere to any specific framework. As POJOs are generally simple, there is no dependency on other libraries, interfaces, or annotations. It can therefore get used in multiple project types (web, desktop, console, etc.) without requiring packages or modules to be imported.

There are getter and setter methods on POJOs, which act as pure data structures. Getters and Setters are useful in retrieving and updating the value of variables outside of the encapsulating class. Setters update variables' values while getters read them.

While there are no restrictions to Java's POJO classes in many ways, some things should get avoided.

POJO class restrictions

It is not acceptable to extend prespecified classes from POJO classes. For example:

// "Sample" does not qualify as a POJO as it extends "javax.servlet.http.HttpServlet"
public class Sample extends javax.servlet.http.HttpServlet { ... }

public class Sample extends javax.servlet.http.HttpServlet { … }

There should be no predefined interfaces in POJO classes. For example:

// "Sample" does not qualify as a POJO class as it implements "javax.ejb.EntityBean"
public class Sample implements javax.ejb.EntityBean { ... }

There should be no predefined annotations in a POJO class. For example:

// "Sample" does not fall under the POJO category because it contains "@javax.persistence.Entity"
@javax.persistence.Entity public class Sample { ... }.

How does POJO Class work?

A POJO class represents a piece of business logic. As part of an MVC architecture, the controller interacts with business logic, which in turn contacts POJOs to access the data.

The following is an explanation of how the POJO class works.

Properties of POJO class

The POJO class has the following properties:

The POJO class must get declared as a public class.
The public default constructor is mandatory.
There may be arguments in the constructor.
The values of all objects must be accessible by other Java programs through public Getters and Setters.
In POJO Classes, objects can have any access modification, including private, public, or protected. All instance variables, however, should get declared as private for better security.
In POJOs, classes shouldn't extend predefined classes.
There should be no predefined interfaces implemented.
There should be no annotations predefined for it.

Code Sample

Following is the sample code for implementing the POJO class in java.

package Jtp.PojoDemo;
public class Emp_details {
private String emp_name;
private String emp_id;
private double emp_sal;
public String getName() {
return emp_name;
}
public void setName(String emp_name) {
this.emp_name = emp_name;
}
public String getId() {
return emp_id;
}
public void setId(String emp_id) {
this.emp_id = emp_id;
}
public double getSal() {
return emp_sal;
}
public void setSal(double emp_sal) {
this.emp_sal = emp_sal;
}
}

//MainClass.java:

package Jtp.PojoDemo;
public class MainClass {
public static void main(String[] args) {
Emp_details obj= new Emp_details();
obj.setName("Sam");
obj.setId("S001");
obj.setSal(50000);
System.out.println("Name: "+ obj.getName());
System.out.println("Id: " + obj.getId());
System.out.println("Salary: " +obj.getSal());
}
}

Output:
Name: Sam
Id: S001
Salary: 50000.0

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Pojo Class in Java: How to Create?

Introduction

POJO class restrictions

How does POJO Class work?

Properties of POJO class

Code Sample

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Pojo Class in Java: How to Create?

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