how to declare interface

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.

what is interface

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.
List and Set also interface. 
You cannot create object in interface

Posted by: Guest on May-28-2021

// Assume we have the simple interface: interface Appendable { void append(string content); } // We can implement it like that: class SimplePrinter implements Appendable { public void append(string content) { System.out.println(content); } } // ... and maybe like that: class FileWriter implements Appendable { public void append(string content) { // Appends content into a file } } // Both classes are Appendable. 0 how to implement a interface in java

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