Java Questions Asked In Selenium Interview
Common Java Interview Questions for Selenium Positions
Java Questions Asked In Selenium Interview
In a Selenium interview, candidates may be asked Java-related questions to assess their coding proficiency. This might include questions about Java basics such as data types, control flow structures, object-oriented programming concepts like inheritance and polymorphism, exception handling, and multithreading. Candidates may also be asked to demonstrate their understanding of Java libraries commonly used in Selenium automation testing, such as WebDriver and TestNG. Additionally, interviewers may inquire about Java best practices, coding standards, and common pitfalls to gauge the candidate's ability to write efficient and maintainable code for test automation.
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1 - What is a constructor in Java and why is it used? A constructor is a special type of method in Java that is used to initialize objects. It has the same name as the class and is automatically called when an object of the class is created. Constructors are used to set initial values for object attributes and ensure that the object is in a valid state when it is created.
2) Explain the difference between method overloading and method overriding in Java. Method overloading occurs when multiple methods in the same class have the same name but different parameters. The signature of the method (name + parameters) is used to differentiate between the methods. Method overriding, on the other hand, occurs when a subclass provides a specific implementation for a method that is already defined in its superclass. In this case, the method in the subclass must have the same name, return type, and parameters as the method in the superclass.
3) What is the difference between an abstract class and an interface in Java? An abstract class is a class that cannot be instantiated on its own and can contain both abstract and non abstract methods. It is used to define common behavior that may be shared by multiple subclasses. An interface, on the other hand, is a reference type in Java that contains only abstract methods. It is used to define a contract for classes that implement the interface to follow. A class can implement multiple interfaces but can only inherit from one abstract class.
4) How does exception handling work in Java? Exception handling in Java allows developers to manage errors and unexpected events that may occur during program execution. This is done using try, catch, and finally blocks. The try block contains the code that may throw an exception, and the catch block is used to handle the exception if it occurs. The finally block is used to execute code that should always be run, regardless of whether an exception is thrown or not.
5) Explain the concept of multithreading in Java. Multithreading in Java allows multiple threads to run concurrently within the same program. Each thread represents a separate path of execution and can perform tasks independently of other threads. This allows for better performance and responsiveness in applications that need to handle multiple tasks simultaneously. Developers can create threads by extending the Thread class or implementing the Runnable interface.
6) What are the different types of access modifiers in Java and explain their visibility levels? Java provides four types of access modifiers: public, private, protected, and default (package private). Public members are accessible from any other class. Private members are only accessible within the same class. Protected members are accessible within the same package or by subclasses. Default members are accessible within the same package but not from outside.
7) How is object oriented programming implemented in Java? Object oriented programming in Java is implemented through the use of classes and objects. A class is a blueprint for creating objects and defines the properties (attributes) and behaviors (methods) of the objects. An object is an instance of a class and can interact with other objects through method calls. Inheritance, encapsulation, and polymorphism are key principles of object oriented programming that are supported in Java.
8) Why is the main method declared as public static void in Java? The main method in Java is the entry point for a Java program and is called by the Java Virtual Machine (JVM) to start the program execution. It is declared as public so that it can be accessed from outside the class. It is declared as static so that it can be called without creating an instance of the class. It is declared as void because it does not return any value.
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