Blog Archives

03: 7 Things you must know about Java locks and synchronized key word

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 lock or monitor. Don’t confuse this with explicit lock utility class that were added in Java 1.5, … Read more...

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 known as the autoboxing. When it converts a wrapper object class Integer back to its primitive type “int”, … Read...

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 key/value pairs. You can store and retrieve values with the keys.

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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,

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Java Interview FAQs

800+ Java Interview Q&As