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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Home › Java & Big Data Interview Q&As › ➡ Java interview › 300+ Core Java Interview Q&As › Archive for Core Java – Objects
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5 Java Object class methods interview questions & answers
Q1. What are the non-final methods in Java Object class, which are meant primarily for extension? A1. The non-final methods are equals( ), hashCode( ), toString( ), clone( ), and…
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8 Java immutable objects interview questions & answers
Best Practice: “Classes should be immutable unless there’s a very good reason to make them mutable….If a class cannot be made immutable, limit its mutability as much as possible.” –…
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Java enum interview questions & answers
Covers the power of enumand 3 design patterns that can be applied with the help of enums. Q1. Why is it a best practice to use enums over static final…
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Java serialization, cloning, and casting interview Q&A
Q1. Which Java interface must be implemented by a class whose instances are transported via a Web service? a. Accessible b. BeanInfo c. Remote d. Serializable A1. Answer is “d”….
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Mocks, stubs, domain, and anemic objects interview Q&A
Q1. What are mock objects? A1. Mock objects are used in unit testing to ensure that your tests don’t fail due to volatility of the data changes. There are mocking…
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Object equals Vs == and pass by reference Vs value
Q1. What is the difference between “==” and equals(..) method when comparing 2 objects?
A1.It is important to understand the difference between identity (i.e. ==) comparison, which is a shallow comparison that compares only the object references, and the equals( ) comparison, which is a deeper comparison that compares the object attributes.…
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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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