Choosing the right data structure is vital to get the job done with proper space vs performance trade-offs. Q1. What are the common data structures, and where would you use…
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Home › Java & Big Data Interview Q&As › ➡ Java interview › 300+ Core Java Interview Q&As › Archive for Core Java – Collection API
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02: Java 8 Streams, lambdas, intermediate vs terminal ops, and lazy loading with simple examples
A stream is an infinite sequence of consumable elements (i.e a data structure) for the consumption of an operation or iteration. Any Collection<T> can be exposed as a stream. It…
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03: Understanding Big O notations with Java
Q1. Have you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? A1. If you are applying for such jobs, you can be quizzed on…
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04: 7 Java Collection Quizzes
Q1. When is an object needs to implement the Comparable interface? a) When adding it to a HashSet. b) When adding it to a TreeSet. c) When adding it to…
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05: 4 Sorting objects in Java interview Q&As
Sorting objects in Java interview Q&As especially understanding Comparable & Comparator interfaces in Java for natural & custom sorting respectively. Q1. If I mention the interface names Comparable or Comparator,…
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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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07: Java Iterable Vs Iterator differences and know how
Q1. What are the differences between Iterator<T> Vs Iterable<T>?
A1. The “Iterable” was introduced to be able to use in the “foreach” loop. A class implementing the Iterable interface can be iterated over. For example,
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public interface Collection<E> extends Iterable<E> |
Hence, it can be used in the foreach loop
08: If Java did not have a stack or map, how would you ….
Q1 If Java did not have a Stack implementation, how would you go about implementing your own? A1 1) Determine the backing data structure (e.g. array, linked list, etc). 2)…
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09: When to use which Java data structure? and why?
List, Set, Map, and Queue(access the ends FIFO or LIFO) are the basic Java data structure interfaces for which there are different implementations to cater for different usage patterns. Java…
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10: 8 Java Maps & Caching Data in Java Interview Q&As
Q1. What is the purpose of a Map interface in Java collection API? A1. A map is a set of associations between pairs of objects. One is known as a…
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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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