DAY : 19 How to use Encapsulation in java

Encapsulation

Encapsulation is a Data protection

In Java, encapsulation is a core object-oriented programming (OOP) principle that bundles data (variables) and the methods (functions) that operate on that data into a single unit, a class, and restricts direct access to some of an object's components, promoting data hiding and controlled access

Access Modifier

Encapsulation is achieved through Access modifier

1.Private - within the same class

2.Default - Within the same package

3.Protection - Within the same package, inherited, class

4.Public - Public to the entire project

**All methods all called as method Signature*

Questions:

1.One can access non private fields and methods of a class (consider class A) from another class (Class B) - True

2.Can we have a Private main method - False

3.All Access Modifier applicable for local variables? - False

Class Example:

public class Google {



    private int emp_salary; 

    public static String ho_address = "Mountain View"; 

    public static boolean working = true; 



    private void get_user_details() {

        int no = 10; 

        System.out.println("All Users Details");

    }



    public void search_Results() {

        System.out.println("Searching Results"); 

    }



}





public class User {

    public static void main(String[] args) { //Method Signature

        Google googleObj = new Google() ;

        //System.out.println(googleObj.emp_salary); 

        System.out.println(Google.working);

        System.out.println(Google.ho_address);



        //googleObj.get_user_details(); 

        googleObj.search_Results(); 

        User.main(); 

    }



    public static void main(){     

        System.out.println("Overloaded Main Method");

    }

}