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

7 votes120 views3 answers
Set textview text android java
Java
0 vote128 views2 answers
Navigation view item selected
Java
0 vote163 views1 answer
Declaration of double array in java
Java
0 vote148 views1 answer
Could not find java in a java_home at /opt/java/openjdk/bin/java docker sonarqube
Java
0 vote148 views1 answer
How to take float input in java
Java
0 vote183 views1 answer
Instance of keyword
Java
38 votes119 views4 answers
Math.random java between 1 and 10
Java
1 vote123 views1 answer
Why is it not recommended to use script elements in jsp?
Java
0 vote144 views1 answer
@crossorigin spring allow all
Java Spring
1 vote90 views1 answer
Reverse integer java
Java