WebDriver is a Class or an Interface?

[Sid]

According to javadoc WebDriver is an Interface.

Please see here : https://selenium.googlecode.com/git-history/master/docs/api/java/org/openqa/selenium/WebDriver.html

But the rule says, We cannot create an object of an Interface.

So what is WebDriver, Class or Interface?

[Krishnan Mahadevan]

Sidharth,

WebDriver is an interface which RemoteWebDriver ( the mother of all WebDriver implementations ) implements. That explains why one is able to assign a concrete implementation object to the interface reference [ WebDriver driver = new FirefoxDriver() ] because all browser web driver implementations such as FirefoxDriver, ChromeDriver, InternetExplorerDriver etc., extend RemoteWebDriver and thus indirectly implement the WebDriver interface [ which is basically a contract that anyone who claims to support browser interaction has to adhere to ]

All said and done, there is NOTHING in Java that states that you cannot create an interface Object. Its called anonymous objects and Java very much supports it [ But then again, that’s completely out of scope of discussion in this forum, because we focus here on WebDriver/Selenium and not Java questions ]

You can read more about anonymous objects in this SO link : http://stackoverflow.com/questions/16880494/how-can-we-create-object-of-interface-in-java 

Thanks & Regards

Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"

My Scribblings @ http://wakened-cognition.blogspot.com/

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[anemuday]

Sid,

Please take a look at the below SO thread, which i asked couple of days ago.

Can we instansiate an Interface

I hope this helps.

Thanks,
Uday
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