Curriculum

Learn Java Programming

Chapter 0: Computer Language Generations and Environment Setup

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Chapter 1: Introduction to Java

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Chapter 2: Java Data Types, Tokens and Variables

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Chapter 3: Working with User Input in Java

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Chapter 4: Java Operators and Expressions

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Chapter 5: Understanding Control Statements in Java

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Chapter 6: Working with Wrapper Classes Arrays in Java

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Chapter 7: Understanding Classes and Methods in Java Part 1

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Chapter 8: Understanding Constructors and Encapsulation in Java

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Chapter 8: Understanding Methods and Objects in Java Part 2

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Chapter 9: Working with Inheritance and Polymorphism in Java

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Chapter 10: Working with Package, Abstract Class and Interface in Java

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Chapter 11: String Handling in Java

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Chapter 12: Understanding Error and Exception Handling in Java

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Chapter 13: Working with I/O Stream Classes and File Handling in Java

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Chapter 14: Working with Multithreading in Java

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Chapter 15: Working with Generics

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Chapter 16: Working with Collection Frameworks

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Chapter 17: Working with AWT and Swings in Java

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Chapter 18: Event Handling in Java

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Chapter 19: Working with JDBC in Java

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Video lesson

Introduction to Inheritance in Java

In this lesson, you will learn

What is Inheritance
Types of Inheritance in Java

What is Inheritance

Inheritance allows a class to inherit properties and methods from another class.
It facilitates code reuse and establishes a relationship between the superclass (or parent class) and the subclass (or child class), where the subclass inherits the features of the superclass.
In Java, inheritance is achieved using the extends keyword.

Here’s a breakdown of inheritance in Java:

Key Concepts:

Superclass (Parent Class):
- The class whose properties are inherited.
Subclass (Child Class):
- The class that inherits from the superclass.
“extends” Keyword:
- Used to indicate that a class inherits from another class.

Features of Inheritance:

Code Reusability:
- Inheritance allows you to reuse existing code, reducing redundancy and making your code more efficient.
“is-a” Relationship:
- It establishes a clear relationship between classes, where a subclass “is-a” type of its superclass. For example, a “Dog” is an “Animal.”
Method Overriding:
- A subclass can provide its own implementation of a method that is already defined in its superclass. This allows for specialized behavior.¹
Method and Field Inheritance:
- Subclasses inherit the fields and methods of their superclasses.

Types of Inheritance

Java supports various types of inheritance in Java.

TypesOfInheritance

1. Single-level inheritance

A subclass inherits from one superclass only.

SingleLevelInheritance

2. Multi-Level Inheritance

A class inherits from a superclass, and then another class inherits from this subclass, forming a multi-level chain.

MultiLevelInheritance

3. Hierarchical Inheritance

Multiple subclasses inherit from a single superclass.

4. Hybrid Inheritance

Hybrid inheritance can be a combination of any of the three types of inheritances supported in Java.

Hybrid InheritanceInJava

5. Multiple Inheritance

Java does not support multiple inheritance directly through classes due to the “Diamond Problem,” but it can be achieved through interfaces.

A class can implement multiple interfaces.

Multiple InheritanceInJava

In the next lesson, you will learn about the implementations of Single Level Inheritance in Java.

End of the lesson….enjoy learning

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