Man has a bestFriend. hence man will have a bestfriend variable.
......who is a Dog. hence bestFriend is an instance of class Dog.
SCJP 5.0 SCWCD 5.0
posted 8 years ago
The Man-Dog example is called "association"; a Man does not cease to be a Man if the Dog dies.
The examples I have given are called "composition"; an Aeroplane without a Wing is no longer an aeroplane in the fullest sense of the word. And if you disagree, try taking the wings off your aeroplane at 29000 feet