What is Java Encapsulation

To pack data of a program into a single unit is called encapsulation.The data hidden from other classes can be access using member function,it is also called as data-hiding .

Data can be accessed using public getter and setter method.in encapsulation the variables in class should be private.

Java Encapsulation Example

// encapsulation demonstration
public class Getset
{ 
    // private variables
    // these can only be accessed by public methods of class 

    private String sName; 
    private int sRoll; 
    private int skAge; 
  
    // get method for age to access  
    // private variable sAge 
    public int sAge()  
    { 
      return sAge; 
    } 
   
    // get method for name
    // private variable sName 
    public String getName()  
    { 
      return sName; 
    } 
      
    // get method for roll
    // private variable sRoll 
    public int getRoll()  
    { 
       return geekRoll; 
    } 
   
    // set method 
    // private variable
    public void setAge( int newAge) 
    { 
     sAge = newAge; 
    } 
   
    // set method
    // private variable
    public void setName(String newName) 
    { 
      sName = newName; 
    } 
      
    // set method for roll to access  
    // private variable 
    public void setRoll( int newRoll)  
    { 
      sRoll = newRoll; 
    } 
} 

public class Test
{     
    public static void main (String[] args)  
    { 
        Getset obj = new Getset(); 
          
        // setting values
        obj.setName("sanu"); 
        obj.setAge(21); 
        obj.setRoll(100); 
          
        // Displaying values
        System.out.println("name: " + obj.getName()); 
        System.out.println("age: " + obj.getAge()); 
        System.out.println("roll: " + obj.getRoll()); 
          
        // Direct access of geekRoll is not possible 
        // due to encapsulation 
        // System.out.println("sroll: " + obj.sRoll);         
    } 
} 

Java Encapsulation Advantages