What is composition in java? And how it is different from inheritance? Help me out

Answer 1

Composition means HAS A
Inheritance means IS A

Example: Car has a Engine and Car is a Automobile

In programming this is represented as:

class Engine {} // The engine class.

class Automobile{} // Automobile class which is parent to Car class.

// Car is an Automobile, so Car class extends Automobile class.
class Car extends Automobile{

// Car has a Engine so, Car class has an instance of Engine class as its member.
private Engine engine;
}

Answer 2

Well, Composition is the OOP concept, where an object appears as a member in other class.

Example

class address {
String city;
int id;
}

class person {
int id;
String name;
address add; //Composition
}

On there other hand, inheritance allows creating new class on basis of existing class to add new functionality.

//base class
class Point {
int x;
int y;
....
}

class Point3d extends Point {
int z; //
}

Here class Point3d will receive all public and protected members of Point class and will have additional members of its own.

Answer 3

thanx it helps😊