DIFFERENCIATE BETWEEN ABSTRACT CLASS AND INTERFACE?

Question

Accepted Answer

Abstract class can have implementation while interface cannot. A class can implement multiple interfaces but can only inherit from one abstract class.

Abstract class can have constructors while interface cannot.
Abstract class can have non-abstract methods while interface can only have abstract methods.
Abstract class can have instance variables while interface cannot.
A class implementing an interface must implement all its methods while a class inheriting from an abstract class can choose to implement or not implement its methods.
Example of abstract class: public abstract class Animal { public abstract void makeSound(); }
Example of interface: public interface Drawable { void draw(); }

DIFFERENCIATE BETWEEN ABSTRACT CLASS AND INTERFACE?

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