Core Java Programming Course- Data Encapsulation

The video tutorial explains the concept of data encapsulation, a fundamental principle of object-oriented programming (OOP). It highlights the issues of direct access to class member variables and demonstrates how to create a class with member variables and methods. The tutorial further explains how to use getters and setters to encapsulate data, preventing direct access and reducing maintenance issues. This approach ensures that changes to variable names do not affect other classes using the class, promoting better programming practices.

Which of the following is NOT one of the four basic principles of object-oriented programming?

• Encapsulation

• Compilation

• Polymorphism

• Inheritance

In the class example, what is the purpose of the 'display details' method?

• To create a new class

• To delete the class object

• To display the class details

• To modify the class variables

What problem arises when other classes directly access member variables?

• Improved readability

• Faster execution

• Compilation errors when variables are renamed

• Increased security

How can you prevent direct access to member variables in a class?

• By using static methods

• By using global variables

• By making them public

• By making them private

What is the role of a getter method in a class?

• To set the value of a variable

• To delete a variable

• To retrieve the value of a variable

• To create a new variable

What is the main benefit of using getters and setters?

• They make the code run faster

• They allow controlled access to class variables

• They make the code more complex

• They increase the size of the code

What happens if you change the name of a private variable in a class?

• It automatically updates in all classes

• It deletes the variable

• It has no effect on other classes using getters and setters

• It causes errors in all classes using it

Why is it not a good practice to expose member variables directly?

• It leads to maintenance issues

• It increases security

• It makes the code more readable

• It improves performance

What keyword is used to differentiate between method-level and class-level variables?

• super

• class

• this

• self

What is the concept of hiding data within small methods called?

• Data encapsulation

• Data inheritance

• Data polymorphism

• Data abstraction