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Use of static in abstract class..

Chandra Bairi
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Joined: Sep 12, 2003
Posts: 152
What exactly is the use of static methods in abstract classes. They can never be overloaded. Are there any classes in java api where a class is abstract and all its methods are static


Thanks,
Shekar
Wayne L Johnson
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Joined: Sep 03, 2003
Posts: 399
I suppose that if you had a class with "service" methods but you didn't want anyone to instantiate it you could create an abstract class that had nothing but static methods. That way other classes could call the methods but not instantiate it.
I don't know of any classes that use this mechanism, but there are other ways of accomplishing the same goal. If you look at the "java.lang.Math" class, it has a bunch of convenience methods that perform mathematical operations. The class itself is declared as "final". All of the methods are "static". And it has a single constructor that's declared as "private". Therefore it can't be instantiated, and it can't be extended.
But either methodology works. It's a matter of conceptually deciding how the class is to be used.
[ October 10, 2003: Message edited by: Wayne L Johnson ]
Cindy Glass
"The Hood"
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Joined: Sep 29, 2000
Posts: 8521
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