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An interface is a 100% abstract class, so we can use an interface for efficient programming. Is there any situation where an abstract class is better than an interface?
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Multiple implementations: An interface can extend one or more Java interfaces; an abstract class can extend another Java class and implement multiple Java interfaces. Multiple Inheritance: Interface supports multiple inheritance; an abstraction does not support multiple inheritance.
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.
An abstract class is mostly used to provide a base for subclasses to extend and implement the abstract methods and override or use the implemented methods in abstract class.
Abstract classes provide you the flexibility to have certain concrete methods and some other methods that the derived classes should implement. On the other hand, if you use interfaces, you would need to implement all the methods in the class that extends the interface.
Abstract classes are used when you do intend to create a concrete class, but want to make sure that there is some common state in all the subclasses or a possible common implementation for some operations.
Interfaces cannot contain either.
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