Java Encapsulation

// Java program to demonstrate encapsulation
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; }
}
 
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);
    }
}

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. Another way to think about encapsulation is, it is a protective shield that prevents the data from being accessed by the code outside this shield.