abstract class vs interface real time example
How to implement an interface using abstract class?
The instance of an abstract class can’t be created. Now as all methods in an interface are abstract methods therefore we can implement it using Abstract Class. 1. Let’s create an Interface at first: Here the three non-implemented methods are the abstract methods 2. Now let’s implement the interface in an Abstract class named Student:
What is the difference between a subclass and an interface?
Subclasses use extends keyword to extend an abstract class and they need to provide implementation of all the declared methods in the abstract class unless the subclass is also an abstract class whereas subclasses use implements keyword to implement interfaces and should provide implementation for all the methods declared in the interface.
Can abstract classes be instantiated?
Abstract classes cannot be instantiated, but they can be subclassed. An abstract class may have static fields and static methods . When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract.
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