Question

JAVA

Write code to define a Customer class, which has id and name attributes of String data type and points attribute of integer data type, without breaking encapsulation.

Answer 1

Encapsulation:-- Encapsulation is the Hiding concept of the data.It is used to wrap the data into a single unit so that any outer member can not access thes rights.Encapsulation is the most important feature of Object Oriented Progarming Language.Java is the one pof the pure Object Oriented Programming Language,It can Ptovide the most security of the data.

Here i have written a Customer class which has three Private attributes which can not accsess out side .It can be access only by using getter and setter method.

You have to save the Customer class as  Customer.java and Encapsulation.java then run the Programe ,You will get this out/put

Customer Name : Sushil Points:120 Customer Id:120

Programe Code:

public class Customer{

private String id;

private String name;

private int points;

public String getId() {

return id;

}

public String getName() {

return name;

}

public int getPoints() {

return points;

}

public String setId(String id) {

id=id;

}

public String setName(String name) {

name=name;

}

public String setPoints(int points) {

points=points;

}

}

public class Encapsulation{

public static void main(String args[]) {

Customer c1 = new Customer();

c1.setName("Sushil");

c1.setId("C-001");

c1.setPoints(120);

System.out.print("Customer Name : " + c1.getName() + " Age : " + c1.getPoints() + "CUstomer ID :" + c1.getId() );

}

}

Benifits of Encapsulation:--

1. A class i having total controll what it has data or field or properties

2. Data or field or properties can be only read or right .