POJO in Java

 POJO stands for Plain Old Java Object.

         It is introduced in Java to increase re-usability and readability of Java programs. 

                - It is used to define objects.

                - POJO class is also used to encapsulate the business logic

There are the following properties of POJO class

• POJO class must be public
• It must have a default public constructor and may have argument constructors
• Getters and Setters methods must be defined to access the objects values
• All instance variables must be declared private.
• override toString() method to display Object's value when called implicitly

For Example:

public class Program {

//instance variables should be private

private long noOfStatements;

private int noOfVariables;

private String functionality;

//default constructor

public Program() {

}

        //Parameterized Constructor

        public Program(long noOfStatements, int noOfVariables, String functionality) {

this.noOfStatements = noOfStatements;

this.noOfVariables = noOfVariables;

this.functionality = functionality;

}

//Getter and Setters methods

public long getNoOfStatements() {

return noOfStatements;

}

public void setNoOfStatements(long noOfStatements) {

this.noOfStatements = noOfStatements;

}

public int getNoOfVariables() {

return noOfVariables;

}

public void setNoOfVariables(int noOfVariables) {

this.noOfVariables = noOfVariables;

}

public String getFunctionality() {

return functionality;

}

public void setFunctionality(String functionality) {

this.functionality = functionality;

}

        //override toString() methods

@Override

public String toString() {

return "Program [noOfStatements=" + noOfStatements + ", noOfVariables=" + noOfVariables + ", functionality="+ functionality + "]";

}

}