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

0 vote277 views1 answer
Java array nested equals
Java
1 vote324 views2 answers
Java: error: release version 5 not supported maven
Java
0 vote287 views1 answer
Android how to get current activity
Java
1 vote281 views1 answer
Java split string on two or more spaces except for words in quotes
Java
1 vote254 views1 answer
How to download java on mint
Java
0 vote295 views2 answers
Java sha256 hex digest
Java
16 votes276 views2 answers
Bufferedreader java
Java
10 votes269 views3 answers
Float java
Java
35 votes271 views2 answers
Priority queue java
Java
1 vote278 views2 answers
Java double to long
Java