aggregation.java

/* 
* Example of using aggregation.
*
* Here if a Telephone is deleted, the screen can still exist. 
*/

Class Ecran;


Class Telephone{
	Ecran screen;
	
	public void Telephone(Ecran screen){
		this.screen = screen;
	}
}

main(){
	Ecran screen = new Ecran();
	Telephone tel = new Telephone(screen);
}

composition.java

/* 
* Example of using composition
*
* Here if a Telephone, its screen will be destroyed by Java's garbage colelctor.
* Ecran cannot exist without Telephone.
*/

Class Ecran;


Class Telephone{
	Ecran screen;
	
	public void Telephone(){
		this.screen = new Screen();
	}
}

main(){
	Telephone tel = new Telephone();
}