what are abstract classes in java
Sometimes we may come across a situation where we cannot provide implementation to all the methods in a class. We want to leave the implementation to a class that extends it. In that case we declare a class as abstract by using abstract keyword on method signature.In my framework I have created my PageBase class as super class of the all page classes. I have collected all common elements and functions into PageBase class and all other page classes extent PageBase class. By doing so, I don't have to locate very common WebElements and it provides reusability in my framework. i)List<String> webs=driver.getWindowHandles(); =>create a list first to store web URLs in list ii)findElements evaluates multiple elements so therefore will assigned to List <WebElement> iii)To handle dynamic elements store it in the list and identify by index: List<WebElement> all=driver.findElements(By.tagname(“”)); (or other locators). Also 1)Abstract classes cannot be instantiated 2)An abstarct classes contains abstract method, concrete methods or both. 3)Any class which extends abstarct class must override all methods of abstract class 4)An abstarct class can contain either 0 or more abstract method.