Java Language Tutorial => Inheritance

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Introduction

Inheritance is a basic object oriented feature in which one class acquires and extends upon the properties of another class, using the keyword extends. For Interfaces and the keyword implements, see interfaces.

Syntax

class ClassB extends ClassA {...}
class ClassB implements InterfaceA {...}
interface InterfaceB extends InterfaceA {...}
class ClassB extends ClassA implements InterfaceC, InterfaceD {...}
abstract class AbstractClassB extends ClassA {...}
abstract class AbstractClassB extends AbstractClassA {...}
abstract class AbstractClassB extends ClassA implements InterfaceC, InterfaceD {...}

Remarks

Inheritance is often combined with generics so that the base class has one or more type parameters. See Creating a Generic Class.

Inheritance
Abstract class and Interface usage: "Is-a" relation vs "Has-a" capability
Abstract Classes
Inheritance and Static Methods
Narrowing and Widening of object references
Overriding in Inheritance
Programming to an interface
Static Inheritance
The Liskov Substitution Principle
Using 'final' to restrict inheritance and overriding
Variable shadowing

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Java Language

Java Language Inheritance

Introduction

Syntax

Remarks

Inheritance Related Examples

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