Encapsulation is defined as the wrapping up of data under a single unit. It is the mechanism that binds together code and the data it manipulates.Other way to think about encapsulation is, it is a protective shield that prevents the data from being accessed by the code outside this shield.
// Java program to demonstrate encapsulation
public class Encapsulate
{
// private variables declared
// these can only be accessed by
// public methods of class
private String geekName;
private int geekRoll;
private int geekAge;
// get method for age to access
// private variable geekAge
public int getAge()
{
return geekAge;
}
// get method for name to access
// private variable geekName
public String getName()
{
return geekName;
}
// get method for roll to access
// private variable geekRoll
public int getRoll()
{
return geekRoll;
}
// set method for age to access
// private variable geekage
public void setAge( int newAge)
{
geekAge = newAge;
}
// set method for name to access
// private variable geekName
public void setName(String newName)
{
geekName = newName;
}
// set method for roll to access
// private variable geekRoll
public void setRoll( int newRoll)
{
geekRoll = newRoll;
}
}
In the above program the class EncapsulateDemo is encapsulated as the variables are declared as private. The get methods like getAge() , getName() , getRoll() are set as public, these methods are used to access these variables. The setter methods like setName(), setAge(), setRoll() are also declared as public and are used to set the values of the variables.
The program to access variables of the class EncapsulateDemo is shown below:
public class TestEncapsulation
{
public static void main (String[] args)
{
Encapsulate obj = new Encapsulate();
// setting values of the variables
obj.setName("Harsh");
obj.setAge(19);
obj.setRoll(51);
// Displaying values of the variables
System.out.println("Geek's name: " + obj.getName());
System.out.println("Geek's age: " + obj.getAge());
System.out.println("Geek's roll: " + obj.getRoll());
// Direct access of geekRoll is not possible
// due to encapsulation
// System.out.println("Geek's roll: " + obj.geekName);
}
}
Output:
Geek's name: Harsh
Geek's age: 19
Geek's roll: 51
Advantages of Encapsulation:
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