Inheritance in Programming Languages
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Questions and Answers

What is inheritance in Java?

Inheritance in Java is creating new classes based on existing classes.

What is the advantage of using inheritance?

Inheritance allows for code reuse and creates a relationship between classes that emphasizes the "is-a" relationship.

What is the relationship between the superclass and subclass in inheritance?

The superclass is the parent class and the subclass is the child class. The subclass inherits properties and methods from the superclass.

In the example provided, which class is the superclass and which is the subclass?

<p>The superclass is Employee and the subclass is Programmer.</p> Signup and view all the answers

What are the three types of inheritance?

<p>Multilevel</p> Signup and view all the answers

What is the difference between single and multilevel inheritance?

<p>Single inheritance involves one subclass inheriting from one superclass. Multilevel inheritance involves multiple levels of inheritance, where a subclass inherits from a superclass, which itself inherits from another superclass.</p> Signup and view all the answers

What is hierarchical inheritance?

<p>Hierarchical inheritance involves multiple subclasses inheriting from a single superclass.</p> Signup and view all the answers

What is the purpose of the 'extends' keyword in Java?

<p>The 'extends' keyword is used to indicate that a class is inheriting from another class. This creates a superclass-subclass relationship.</p> Signup and view all the answers

What is overriding in Java?

<p>Overriding occurs when a subclass provides its own implementation for a method that already exists in its superclass. This allows the subclass to change how that method behaves.</p> Signup and view all the answers

What is the purpose of the 'super' keyword in Java?

<p>The 'super' keyword allows a subclass to refer to members of its superclass, specifically to access overridden methods or to call superclass constructors.</p> Signup and view all the answers

Study Notes

Inheritance in Programming Languages

  • Inheritance allows creating new classes based on existing ones.
  • When inheriting from an existing class, you reuse its fields and methods.
  • You can add new methods and fields to the new class.
  • Inheritance represents an IS-A relationship (also called a parent-child relationship).
  • The existing class is the superclass, and the new class is the subclass.

Types of Inheritance

  • Single: A subclass inherits from only one superclass.
  • Multilevel: A subclass inherits from a superclass that, in turn, inherits from another superclass.
  • Hierarchical: Multiple subclasses inherit from a single superclass.

Example: Programmer and Employee

  • Employee is the superclass (parent class).
  • Programmer is the subclass (child class).
  • The Programmer class (subclass) inherits attributes and methods from the Employee class (superclass) that are relevant. It can add additional data to describe programmer roles.

Code Example (Java)

  • Person Class: Defines basic attributes like ID and name.
  • Employee Class: Inherits from Person and adds a salary field.
  • Methods to handle printing information and adding to salary are included.

Overriding in Inheritance

  • If a superclass has a method, a subclass can create a method with the same name and parameters.
  • This action is called overriding.
  • The subclass method replaces the superclass method. This lets the subclass customize the behavior implemented by the superclass's method.

Example Usage

  • Create objects using the defined classes.
  • Use the methods to manipulate the data.
  • Use inheritance to create methods for a specific class from existing method in superclass.

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Description

This quiz explores the concept of inheritance in programming languages, focusing on how new classes can be created based on existing ones. It covers various types of inheritance, including single, multilevel, and hierarchical inheritance, with practical examples to illustrate the IS-A relationship between classes.

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