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

4 votes147 views3 answers
Android dialog modal
Java
0 vote133 views2 answers
Java print 2d array row and column
Java
1 vote144 views1 answer
Java jtextfield text bold
Java
0 vote140 views1 answer
React-native maven package 404 not found
Java
53 votes146 views5 answers
How to print array
Java
1 vote130 views1 answer
Android glide dependencies
Java
0 vote171 views2 answers
Extract substring in string java
Java
11 votes145 views1 answer
Declare a hashmap in java
Java
0 vote203 views1 answer
Set location of a label java
Java
1 vote144 views1 answer
Does set automatically get rid of duplicates in java
Java