asked on abstract class with all non abstract mentods
Hi,
Can a abstract class with all non abstract mentods? Is that is possible. I am under impression that atleast one method of abstract class should be abstract. What are advantages and practical uses of abstract methods compared to interface. I see many cases abstract class is implements a interface. Then a concrete class extends the abstract class. I wonder what is use of this pattern
interface--->abstract class(implements)--->concr
Can a abstract class with all non abstract mentods? Is that is possible. I am under impression that atleast one method of abstract class should be abstract. What are advantages and practical uses of abstract methods compared to interface. I see many cases abstract class is implements a interface. Then a concrete class extends the abstract class. I wonder what is use of this pattern
interface--->abstract class(implements)--->concr
JavaJava EEProgramming Languages-OtherProgrammingSystem Programming
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Jeffrey Dake
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Yeah I didn't mention default implementations as I'm concerned it may confuse your understanding if you're not clear on abstract classes vs interfaces yet.
But anywhere here's some info on them:
https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
(Oracle added this capability so they could extend some existing interfaces in the Java language without breaking a ton of existing code).
Doug
But anywhere here's some info on them:
https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
(Oracle added this capability so they could extend some existing interfaces in the Java language without breaking a ton of existing code).
Doug
ASKER
>> Can a abstract class with all non abstract methods?
Yes there's nothing wrong with that. It's not common but it's allowed.
it is kind of defeating the purpose for which we create abstract class right?
if we do not have abstract methods in it it seems very uncommon to me.
Not always, you may just have a whole bunches of functions you want inherited but don't want that base class to ever be instantioated.
any good links or examples on this?