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

64 votes174 views6 answers
Get last element of array java
Java
0 vote169 views2 answers
Lcm of two number in java
Java
0 vote155 views1 answer
Java equals on recursive apache commons
Java
4 votes198 views2 answers
Java how to find the largest number in an arraylist
Java
-1 vote157 views1 answer
Spring security after login redirect
Java Spring
0 vote159 views1 answer
Java how to handle HTTP GET request after establishing TCP connection
Java
3 votes199 views6 answers
How to change the value of an arraylist in java
Java
0 vote155 views1 answer
Period java springboot
Java
0 vote145 views1 answer
Result set methods
Java
0 vote143 views1 answer
Add two numbers in java
Java