Abstract Class | Interface

Describes

Attributes, methods

Methods

For classes

With close connections (inheritance)

That could have nothing in common

Multiple Inheritance

Key words

Implements interface
Extends class

Extends interface

Attributes

Methods without realisation

 (

abstract

keyword)

Methods with realisation

 (

default

keyword)

Constructor

Access modifiers

any

public

(default),

private

for methods with realisation