Core Java Programming Course- Class Inheritance

The video tutorial explains the concept of inheritance in Java, emphasizing its importance for code reusability. It provides examples using simple classes to demonstrate how inheritance allows a subclass to use fields and methods from a superclass. The tutorial includes a practical example with classes representing geometric shapes like Polygon, Triangle, and Rectangle, illustrating the 'is-a' relationship in inheritance. The session concludes with a brief overview of the benefits of inheritance and a preview of future topics.

What is the primary benefit of using inheritance in Java?

• To make code execution faster

• To enhance code reusability

• To increase code redundancy

• To simplify syntax

In the example with Class 1 and Class 2, what keyword is used to indicate inheritance?

• uses

• extends

• inherits

• implements

Which method in Class 2 demonstrates the use of inherited fields from Class 1?

• doMultiplication

• doDivision

• doAddition

• doSubtraction

What is the role of the main method in the context of inheritance?

• To declare variables

• To compile the program

• To create objects and test class methods

• To define new classes

In the Polygon example, which classes extend from Polygon?

• Circle and Square

• Triangle and Rectangle

• Hexagon and Pentagon

• Ellipse and Parallelogram

What is the formula used to calculate the area of a triangle in the example?

• base / height

• 0.5 * base * height

• base * height

• base + height

What does the 'is-a' relationship signify in inheritance?

• A class is unrelated to its subclass

• A superclass is a type of its subclass

• A subclass is a type of its superclass

• A class is unrelated to its superclass

Which method is used to set the base and height in the Polygon class?

• setDimensions

• setValues

• setBaseAndHeight

• setSize

In the context of inheritance, what does a subclass inherit from its superclass?

• Only methods

• Only fields

• Both fields and methods

• Neither fields nor methods

Which of the following is NOT a correct statement about inheritance?

• A subclass can add new methods of its own

• A subclass can override methods of its superclass

• A subclass can inherit private fields of its superclass

• A subclass can use public methods of its superclass