Object composition in Java

Composition offers better test-ability of a class than Inheritance . If one class consists of another class, you can easily construct a Mock Object representing a composed class for the sake of testing. This privilege is not given by inheritance.

Composition offers better test-ability of a class than Inheritance . If one class consists of another class, you can easily construct a Mock Object representing a composed class for the sake of testing. This privilege is not given by inheritance.

Composition relationships are part-whole relationships where the part must constitute part of the whole object . For example, a heart is a part of a person’s body. The part in a composition can only be part of one object at a time.

Composition relationships are part-whole relationships where the part must constitute part of the whole object . For example, a heart is a part of a person’s body. The part in a composition can only be part of one object at a time.

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.

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.