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getInstacne() for an abstract class

Grishma Dube
Ranch Hand

Joined: Jul 01, 2003
Posts: 275
I have a very basic question. We cannot create instance of an abstract class.
e.g. Calendar class of util pkg is ab abstract class. so if we try to create an instace of this using new operator, it gives error.
However, we can call getInstance() method to get an instance of Calendar class. Can anyone explain me, what exactly happens when we call getInstance() method??
Marilyn de Queiroz

Joined: Jul 22, 2000
Posts: 9059
The default is to create a new GregorianCalendar (which is not abstract).

"Yesterday is history, tomorrow is a mystery, and today is a gift; that's why they call it the present." Eleanor Roosevelt
Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
Note that GregorianCalendar is a subclass of Calendar. This is an example of Polymorphism in the Java 2 Standard Edition API. Another example can be found with the public void paint(Graphics g) method that many windowing components have.

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