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Difference between abstract class and interface
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Answer Posted / rama krishna
Abstract class:
*A class of only Concrete or only Abstract or both.
*Any java class can extend only one abstract class.
*It won’t force the programmer to implement/override all its methods.
*It takes less execution time than interface.
* It allows constructor.
This class can’t be instantiated directly.
A class must be abstract when it consist at least one abstract method.
It gives less scope than an Interface.
It allows both variable & constants declaration.
It allows methods definitions or declarations whenever we want.
It gives reusability hence it can’t be declared as “final”.
Interface:
only abstract methods.
A class can implements any no. of interfaces
(this gives multiple interface inheritance )
It forces the programmer to implement all its methods
Interface takes more execution time due to its complex hierarchy.
* It won’t allow any constructor.
It can’t be instantiated but it can refer to its subclass objects.
It gives more scope than an abstract class.
By default, methodspublic abstract
variablespublic static final.
It allows methods declarations whenever we want . But it involves complexity.
Since they give reusability hence they must not be declared as “final”.
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