CareerCup

compostion is a OOP concept:

it works similar funcionality to inheritance but creates a different relationship. Compostion a "has-a" relationship - versus the inhertiance of "is-a" relationship

compostion - the way you model objects that contain other objects. In OOP- you use instance variables of one object to hold references to other objects.

in java- for compostion - you instance the object in another object(dependence injection)

public class SportsCar{
//....
}

public class Ferrari{
  private SportsCar newCar = new SprotsCar();

}

In java- inheritance is created through the extends - example Ferrari extends SportCar.

{{public class SportsCar{
private int engineSize;

public void add(int size){

}
public void remove(){
}
}

public Ferrari extends SportCar{
private SportsCar newCar;

}

}