Real Time Automation Interview Questions - Part 5

In continuation with the latest series of Real Time Automation Interview Questions, we present you the part 5 of the course structure. Click on below links for previous parts.

Part 1 

Part 2

Part 3

Part 4

Real Time Automation Interview Questions - Part 5

• Use of Constructor?
• The purpose of constructor is to initialize the object of a class while the purpose of a method is to perform a task by executing java code. 
• Constructors cannot be abstract, final, static and synchronised while methods can be. Constructors do not have return types while methods do.
• Difference between static and non-static methods?
• Static method uses compile time binding or early binding. 
• Non-static method uses run time binding or dynamic binding. 
•  A static method cannot be overridden being compile time binding. A non-static method can be overridden being dynamic binding. 
• Links : https://www.geeksforgeeks.org/difference-between-static-andnon-static-method-in-java/
• What is Super keyword in Java?
• The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. 
• The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.
• Difference between break and continue statement?
• Break statement resumes the control of the program to the end of loop and made executional flow outside that loop. 
• Continue statement resumes the control of the program to the next iteration of that loop enclosing 'continue' and made executional flow inside the loop again
• Difference between this and super?
• this keyword mainly represents the current instance of a class. 
• On other hand super keyword represents the current instance of a parent class. 
• this keyword used to call default constructor of the same class.
• What is the difference between length and length() in Java?
• array.length: length is a final variable applicable for arrays. With the help of the length variable, we can obtain the size of the array.
• string.length() : length() method is a final variable which is applicable for string objects. The length() method returns the number of characters present in the string.
• What are the types of assertions in Java?
• Selenium Assertions can be of three types: “assert”, “verify”, and ” waitFor”. 
• When an “assert” fails, the test is aborted. 
• When a “verify” fails, the test will continue execution, logging the failure. 
• A “waitFor” command waits for some condition to become true.
• Have you used the action class and where it is used?
• Actions class is an ability provided by Selenium for handling keyboard and mouse events. Actions action = new Actions(driver); 
• action.moveToElement(element).click().perform(); 
• The perform() method is used to perform the series of actions that are defined. 
• Link : https://www.browserstack.com/guide/action-class-in-selenium
• What is the difference between checked and unchecked exception?
• There are two types of exceptions: checked exception and unchecked exception. 
• The main difference between checked and unchecked exception is that the checked exceptions are checked at compile-time while unchecked exceptions are checked at runtime. 
• checked exceptions – SQLException,IOException,ClassNotFoundException,InvocationTargetException 
• unchecked exceptions – NullPointerException,ArrayIndexOutOfBoundsException,ArithmeticException,IllegalA rgumentException NumberFormatException
• Apart from sendKeys, is there any other way to perform the desired operation?
• WebDriver driver = new FirefoxDriver(); 
• JavascriptExecutor executor = (JavascriptExecutor)driver; executor.executeScript("document.getElementBy Id("textbox_id").value='new value';);