Abstract vs interface java

Interface vs abstract class java

an abstract class can have abstract and non-abstract instance methods while an interface can have abstract or default instance methods;
an abstract class can extend another abstract or regular class and an interface can only extend another interface;
an abstract class can extend only one class while an interface can extend any number of interfaces;
an abstract class can have final, non-final, static, non-static variables (regular fields) while an interface can only have static final variables;
an abstract class can provide an implementation of an interface but an interface cannot provide an implementation of an abstract class;
an abstract class can have a constructor and an interface cannot;
in an abstract class, the keyword abstract is mandatory to declare a method as an abstract one while in an interface this keyword is optional.

Source: grepper.com

Interface vs abstract class java

Interfaces specify what a class must do. 
It is the blueprint of the class.
It is used to achieve total abstraction. 
We are using implements keyword for interface.

Basic statement we all know in Selenium is
WebDriver driver = new FirefoxDriver();
WebDriver itself is an Interface.
So we are initializing Firefox browser
using Selenium WebDriver.
It means we are creating a reference variable
of the interface and creating an Object.
So WebDriver is an Interface and
FirefoxDriver is a class.

Abstract Class
1) Abstract class can contain abstract methods,
concrete methods or both
2) Except private we can have any access
specifier for methods in abstract class.
3) Except private variables can have any access
specifiers
4)We cannot achieve multiple inheritance using
abstract class.

Source: grepper.com

Similar codes

-2 votes204 views2 answers
What is hashset in java
Java
1 vote186 views2 answers
How to convert epoch time to date in java
Java
12 votes220 views4 answers
Html CSS js
Java
9 votes186 views3 answers
Circle image android
Java
-1 vote185 views2 answers
Android dismiss keyboard
Java
0 vote203 views1 answer
Marshalling in java
Java
3 votes194 views2 answers
Remove duplicates from sorted array
Java
16 votes193 views5 answers
Converting char array to string
Java
0 vote205 views1 answer
Java setting logging with rotation logback
Java
0 vote196 views1 answer
How to make plugin wait spigot
Java