What is association Aggregation and composition explain with examples?

This is a layered model of system construction (design) where a single component references others only through their (public/export) interfaces . The horizontal structure relates different components of same realm that can play the same role in the same layer.

This is a layered model of system construction (design) where a single component references others only through their (public/export) interfaces . The horizontal structure relates different components of same realm that can play the same role in the same layer.

Inheritance and composition are two programming techniques developers use to establish relationships between classes and objects. Whereas inheritance derives one class from another, composition defines a class as the sum of its parts .

For example, if a class Bulb inherits another class Device, then we can say that Bulb is having is-a relationship with Device , which implies Bulb is a device.

The main reason to use composition is that it allows you to reuse code without modeling an is-a association as you do by using inheritance . That allows stronger encapsulation and makes your code easier to maintain as Joshua Bloch explains in the 3rd edition of his book Effective Java.16 Oca 2018

The main reason to use composition is that it allows you to reuse code without modeling an is-a association as you do by using inheritance . That allows stronger encapsulation and makes your code easier to maintain as Joshua Bloch explains in the 3rd edition of his book Effective Java.16 Oca 2018

Inheritance and composition are two programming techniques developers use to establish relationships between classes and objects. Whereas inheritance derives one class from another, composition defines a class as the sum of its parts .