Difference Between Interface and Abstract Class

[wisden]

Abstract classes can have implementations for some of its
members (Methods), but the inteface class can't have
implementation for any of its members.

[keylogger]

interface is known as multiple inheritance and An abstract class is a class that is designed to be specifically used as a base class.

[James Andrew]

This is really good question you asked share some information about it. Well, an interface only contains method definitions but does not contain any code.

[Thomasgrivera]

Abstract class-Abstract class for a method must be declared as abstract. Abstract methods have no implementation.
Interface-For all default interface methods are only abstract methods. So you can not declare variables or concrete methods in interfaces.

[bangal65o]

An interface is an entity that is defined by the word Interface.
Abstract class is a special kind of class that cannot be instantiated.

[jammyshan]

Abstract class and interface both are used to achieve abstraction where we can declare the abstract methods. Abstract class and interface both can't be instantiated.

But there are many differences between abstract class and interface that are given below.

Abstract class

• Abstract class can have abstract and non-abstract methods.
• Abstract class doesn't support multiple inheritance.
• Abstract class can have final, non-final, static and non-static variables.
• Abstract class can provide the implementation of interface.

Interface

• Interface can have only abstract methods. Since Java 8, it can have default and static methods also.
• Interface supports multiple inheritance.
• Interface has only static and final variables.
• Interface can't provide the implementation of abstract class.

Hope my answer clears your doubt.