Selenium WebDriver with Java - Basics to Advanced and Frameworks - What are Abstract Classes and how Different are they

The video tutorial explains the concept of abstraction in Java, focusing on abstract classes and methods. It uses a real-life scenario involving aircraft construction to illustrate how abstraction works. The tutorial also includes a practical exercise to demonstrate the implementation of abstract methods and classes. Additionally, it compares abstract classes with interfaces, highlighting their differences and similarities.

What is the primary purpose of abstraction in Java?

• To increase the execution time of programs

• To make the code more complex

• To hide the implementation details from the user

• To provide a complete implementation of methods

In the aircraft construction scenario, what is the role of the parent class?

• To provide specific color schemes for aircrafts

• To define global rules and guidelines for aircraft construction

• To manage only the safety guidelines

• To implement all methods for child classes

What is an abstract method in Java?

• A method with a complete implementation

• A method that is only used in interfaces

• A method that is private and cannot be accessed

• A method without a body that must be implemented by child classes

How does an abstract class differ from an interface in Java?

• Abstract classes cannot be inherited, while interfaces can

• Interfaces can have concrete methods, while abstract classes cannot

• Abstract classes can have both abstract and concrete methods, while interfaces can only have abstract methods

• Interfaces are used for inheritance, while abstract classes are not

What keyword is used to inherit properties from a parent class in Java?

• extends

• inherits

• implements

• inheritsFrom

Why can't you instantiate an abstract class in Java?

• Because it may contain methods without implementation

• Because it is not allowed to have any methods

• Because it contains private methods

• Because it is only used for interfaces

What access modifiers are allowed for methods in an abstract class?

• Only public

• Public, protected, or default

• Only protected

• Only private

What is the main difference between abstract classes and interfaces regarding method implementation?

• Neither can have implemented methods

• Abstract classes can have implemented methods, interfaces cannot

• Interfaces can have implemented methods, abstract classes cannot

• Both can have implemented methods

Which keyword is used to implement an interface in Java?

• uses

• implements

• inherits

• extends

What must be true for all methods in an interface?

• They must be private

• They must have a body

• They must be abstract

• They must be protected