Java Inheritance Flashcards
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Questions and Answers

What is inheritance in Java?

The process where one class acquires the properties (methods and fields) of another.

What is a subclass?

The class which inherits the properties of another (derived class, child class).

What is a superclass?

The class whose properties are inherited (base class, parent class).

What keyword is used to inherit the properties of a class?

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

What is the syntax to extend a class?

<p>class Sub extends Super {..........}</p> Signup and view all the answers

What can a superclass reference variable hold?

<p>A subclass object.</p> Signup and view all the answers

What does a subclass inherit from its superclass?

<p>All the members (fields, methods, and nested classes), excluding constructors.</p> Signup and view all the answers

What is the super keyword used for?

<p>To differentiate the members of the superclass from the members of the subclass and to invoke the superclass constructor.</p> Signup and view all the answers

How do you invoke a superclass constructor?

<p>You use the <code>super</code> keyword with parameters if necessary.</p> Signup and view all the answers

What does the IS-A relationship signify?

<p>It indicates that an object is a type of another object.</p> Signup and view all the answers

How does the extends keyword contribute to inheritance?

<p>It allows subclasses to inherit all properties of the superclass except private properties.</p> Signup and view all the answers

What does the implements keyword do?

<p>It is used with classes to inherit properties of an interface.</p> Signup and view all the answers

What does the instanceof keyword check?

<p>It checks if an object is an instance of a specific class or interface.</p> Signup and view all the answers

What is a HAS-A relationship in Java?

<p>It signifies that a class has a certain property or attribute.</p> Signup and view all the answers

What are the types of inheritance?

<p>Single inheritance, multi-level inheritance, hierarchical inheritance, and multiple inheritance.</p> Signup and view all the answers

Study Notes

Inheritance Concepts

  • Inheritance enables a class to acquire properties (methods and fields) from another class, structured in a hierarchical manner.

Class Relationships

  • Subclass: A derived or child class that inherits properties from another class.
  • Superclass: A base or parent class whose properties are inherited by subclasses.

Keywords in Inheritance

  • extends: The keyword used to inherit properties from another class.
  • extends Syntax: Defined as class Sub extends Super { ... }, indicating subclass inherits from superclass.

Superclass Reference

  • A reference variable of the superclass can hold subclass objects but provides access only to superclass members. For full access, use a subclass reference variable.

Inheritance Member Access

  • Subclasses inherit all members (fields, methods, nested classes) from their superclass, excluding constructors.
  • Superclass constructors can be invoked from subclasses using the super keyword.

Utilizing the super Keyword

  • Distinguishes members of the superclass from subclass members having the same names (e.g., super.variable, super.method()).
  • Calls the superclass constructor, particularly useful for parameterized constructors: super(values);.

IS-A Relationship

  • An IS-A relationship indicates that one object is a type of another.
  • Example: public class Dog extends Mammal, asserting that Dog is a type of Mammal.

Structure of IS-A Relationships

  • The extends keyword establishes inheritance where subclasses inherit properties of the superclass, excluding private properties.
  • The implements keyword allows classes to inherit properties from interfaces, not from other classes.

instanceof Keyword

  • Used to check if an object is an instance of a particular class or interface, confirming relationships within the class hierarchy.

HAS-A Relationship

  • Reflects the usage indicating that a certain class possesses or contains another class.
  • Enhances code reuse and reduces redundancy by defining classes separately.

Inheritance Types

  • Single Inheritance: A subclass inheriting from one superclass.
  • Multilevel Inheritance: A class derived from another class, forming a chain of inheritance.
  • Hierarchical Inheritance: Multiple subclasses derived from one superclass.
  • Multiple Inheritance: A class inheriting from more than one superclass (supported by interfaces in Java).

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Description

Test your knowledge of Java inheritance with these flashcards. Learn key terms like 'inheritance', 'subclass', and 'superclass', and understand how they fit into the object-oriented programming paradigm. Perfect for Java learners looking to reinforce their understanding of class relationships.

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