Java Inheritance:
→ Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another.
→ The class which inherits the properties of other is known as subclass (derived class, child class) and the class whose properties are inherited is known as superclass (base class, parent class).
extends Keyword:
→ It is used to inherit the properties of a class.
class Parent
{
}
class Child extends Parent
{
}
Types of Inheritance:
Single Inheritance:
→ When a class extends another one class only.
Class A
{
}
Class B extends A
{
}
Multilevel Inheritance:
→ One can inherit from a derived class, thereby making this derived class the base class for the new class.
Class X
{
}
Class Y extends X
{
}
Class Z extends Y
{
}
Hierarchical Inheritance:
→ One class is inherited by many sub classes.
Class X
{
}
Class Y extends X
{
}
Class Z extends X
{
}
-------------
2. Java Inheritance
● Inheritance can be defined as the process where one class acquires the
properties (methods and fields) of another.
● The class which inherits the properties of other is known as subclass (derived
class, child class) and the class whose properties are inherited is known as
superclass (base class, parent class).
3. extends keyword
● It is used to inherit the properties of a class.
class Parent
{
}
class Child extends Parent
{
}
4. Types of Inheritance - Single Inheritance
● When a class extends another one class only.
Class A
{
}
Class B extends A
{
}
5. Types of Inheritance - Multilevel Inheritance
● One can inherit from a derived class, thereby making this derived class the
base class for the new class.
Class X{
}
Class Y extends X{
}
Class Z extends Y{
}
6. Types of Inheritance - Hierarchical Inheritance
● One class is inherited by many sub classes.
Class X{
}
Class Y extends X{
}
Class Z extends X{
}
