Java Interview Made Easy for Automation Testers – Mock Session Inside | SoftwareTestingbyMKT

This mock Java interview session focuses on core Java concepts for automation testers. The candidate demonstrates a strong understanding of topics such as arrays vs. collections, iterators, method overriding, immutability, abstract methods, and the continue keyword, showcasing a solid foundation in Java programming.

Arrays & Collections

• 00:00:06 Arrays are fixed-size data structures that can store only homogeneous data, while collections are dynamic and can store heterogeneous data. The Collections Framework in Java offers various interfaces like List, Set, and Queue, and classes like ArrayList, LinkedList, and Vector, organized into java.util.Collection and java.util.Map packages.

Iterators

• 00:01:38 Iterators provide a way to traverse elements in a collection. ListIterator allows forward and backward iteration, whereas Iterator only supports forward iteration. The Iterator interface is a fundamental part of the Java Collection Framework.

Method Overriding

• 00:09:11 Method overriding occurs when a child class provides its implementation for a method already defined in its parent class. The super keyword can be used to call the parent class's method. To prevent overriding, methods can be declared as final or static, or the class can be declared as final.

Immutability

• 00:11:31 String objects in Java are immutable, meaning their values cannot be changed after creation. String Buffer and String Builder are mutable counterparts that allow changes to their contents through various methods. Immutability is a feature that ensures data integrity in Java.

Abstract Methods & Abstraction

• 00:15:36 Abstract methods are declared without implementation, typically found in abstract classes. They are used to hide crucial information from external access and are implemented in child classes. Abstraction is used to achieve inheritance and focuses on hiding implementation details while revealing only essential information.