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Why do we Upcast ChromeDriver to WebDriver?
driver = new ChromeDriver(); WebDriver is an interface and all the methods which are declared in Webdriver interface are implemented by respective driver class. But if we do upcasting,we can run the scripts in any browser . i.e running the same automation scripts in different browsers to achieve Runtime Polymorphism.
What is Upcasting in Selenium WebDriver?
While Upcasting (i.e. Assigning Sub Class Object reference to Super Class Object reference) can be automatically done by Java. But Downcasting (i.e. Assigning Super Class Object reference to Sub Class Object reference) cannot be done automatically by Java, but we need to do it manually by following the below syntax –
Can we instantiate WebDriver?
Question2: WebDriver is an interface, then can we create an object instance of an interface? Yes, you can create concrete instances that implement an interface. In fact, to use any interface there must be at least one concrete implementation.
What is super interface for WebDriver?
Hi Dushyant, SearchContext is the super interface of the Webdriver. SearchContext is the super most interface in selenium, which is extended by another interface called WebDriver. All the abstract methods of SearchContext and WebDriver interfaces are implemented in RemoteWebDriver class.
What is Upcasting in Java?
Upcasting is a type of object typecasting in which a child object is typecasted to a parent class object. By using the Upcasting, we can easily access the variables and methods of the parent class to the child class.
What is the hierarchy of WebDriver?
SearchContext is the top most interface in WebDriver hierarchy. This interface consists of two methods findElement(By by) and findElements(By by). This interface is extended by both WebDriver and WebElement interfaces.
Why is WebDriver an interface?
A WebDriver consist of all related basic methods which could be performed on a browser. The main interface to use for testing, which represents an idealised web browser. The methods in this interface fall into three categories: Control of the browser itself.
How to run upcasting scripts in different browsers?
WebDriver is an interface and all the methods which are declared in Webdriver interface are implemented by respective driver class. But if we do upcasting,we can run the scripts in any browser .i.e running the same automation scripts in different browsers to achieve Runtime Polymorphism. WebDriver driver = new FirefoxDriver();
Is there an instance of Webdriver in Firefox?
Let’s see both of them in detail. The FirefoxDriver instance which gets created based on above statement will be only able to invoke and act on the methods implemented by FirefoxDriver and supported by Firefox Browser only. We know that FirefoxDriver is a class and it implements all the methods of WebDriver interface.
Can a webdriver driver be implemented in any browser?
If you define driver as a WebDriver, switching will be very easy. If we use this statement in our script then the WebDriver driver can implement any browser. Every browser driver class implements WebDriver interface and we can get all the methods. It helps you when you do testing on multiple browsers.
How to create an object in firefoxdriver class?
We can create Object of a class FirefoxDriver by taking reference of an interface (WebDriver). In this case, we can call implemented methods of WebDriver interface. As per the above statement, we are creating an instance of the WebDriver interface and casting it to FirefoxDriver Class.