7 Things you must know about Java locks and synchronized key word summarizes the key basics. #1. Each Java class and object (i.e. instance of a class) has an intrinsic…
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Home › Java & Big Data Interview Q&As › ➡ Java interview › 300+ Core Java Interview Q&As › Archive for Core Java – Understanding
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03: Java autoboxing & unboxing benefits & caveats interview Q&As
Q1. What do you understand by the terms “autoboxing” and “autounboxing” in Java? A1. Java automatically converts a primitive type like “int” into corresponding wrapper object class Integer. This is…
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06: HashMap & HashSet and how do they internally work? What is a hashing function?
HashMap & HashSet are not only one of the frequently used data structures, but also one of the popular interview topics. Q1. How does a HashMap store data? A1. As…
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Understanding Overriding, Hiding, and Overloading in Java? How does overriding give polymorphism?
Overriding, Hiding, and Overloading are important core Java concepts and you will be quizzed on job interviews or written tests.
What is overriding?
An instance method overrides all accessible instance methods with the same signature in super classes. If overriding were not possible, you can’t have the OO concept known as polymorphism.…
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Hope this detailed Q&As approach will help you open more doors without feeling stagnated, earn more, attend more interviews & choose from 2-6 job offers. Even you can go contracting or freelancing or change jobs every 2-3 years to expand your horizons. Nobody knows everything, but quality of answers to some of the key & frequently asked Java & Big Data interview questions will go a long way in getting multiple job offers. I often chose from 4-6 offers. It pays to prepare.
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