Design concept

Both are building (Has - A - Relationship).

Composition (strong)

• Object cannot exist without owner.
• Preferred over inheritance
• Makes code:
  • easier to change
  • easier to test
  • less tightly coupled

class Car {
	private Engine engine;
}

Aggregation (weak)

• Object can exist independently.
• More on communication use, to explain the relationship

class Team {
	private Player player;
}