What is difference abstract class and interface?

What is difference abstract class and interface?

Difference between Abstract Class and Interface

What is the difference between abstract class and interface?

Difference Between Abstract Class and Interface. Abstract class and Interface are two object oriented constructs found in many object oriented programming languages like Java. Abstract class can be considered as an abstract version of a regular (concrete) class, while an interface can be considered as a means of implementing a contract.

When to use interface instead of abstract class?

Abstract classes should be used primarily for objects that are closely related, whereas interfaces are best suited for providing common functionality to unrelated classes. If you are designing small, concise bits of functionality, use interfaces. If you are designing large functional units, use an abstract class.

Can you implement an interface in abstract class?

In Java, an abstract class can implement an interface, and not provide implementations of all of the interface’s methods. It is the responsibility of the first concrete class that has that abstract class as an ancestor to implement all of the methods in the interface.

What is the advantage of abstract classes over interfaces?

Abstract classes have the advantage of allowing better forward compatibility. Once clients use an interface, we cannot change it; if they use an abstract class, we can still add behavior without breaking the existing code. If we want to provide common, implemented functionality among all implementations of our component, use an abstract class. Abstract classes allow us to partially implement our class, whereas interfaces contain no implementation for any members. Example