Difference between dependency and composition?

Question

Definitions taken from here

Dependency

Change in structure or behaviour of a class affects the other related class, then there is a dependency b

Answer 1

The difference can be seen in the two constructors:

• Dependency: The Address object comes from outside, it's allocated somewhere else. This means that the Address and Employee objects exists separately, and only depend on each other.

• Composition: Here you see that a new Engine is created inside Car. The Engine object is part of the Car. This means that a Car is composed of an Engine.