Java Collections Interview QuestionsFor more java articles ,Click here to Subscribe JavaHungry. Java Hungry. Java developers tutorials and coding. We have already shared the most frequently asked java interview questions for experience candidates. Also shared the tricky coding interview questions in our previous posts. Today , we will learn about the top 50 java collections interview questions and answers. Interviewer may choose to ask any question.
Java collections framework Interview Questions & Answers
These interview questions seems to be too common and appear in almost many interviews and that's the reason I never asked so called frequently asked or popular interview question, instead I ask something which is not so common like: 1 What is CopyOnWriteArrayList, how it is different than ArrayList and Vector? Generics, dynamic growing 7 What is BlockingQueue, how it is different than other collection classes flow control 8 How do you iterator over Synchronized HashMap, do you need to lock iteration and why? If anyone wants to answer this question , they must required a very good understanding of Java Collection framework which is whole purpose of these interview questions. By the way can you please share pdf version of your java collection interview for download? I think Collection interview questions listed here are very much appear in Capegemini or Tech Mahindra interview. Answer is : If you are using any custom object in Map as key, you need to override equals and hashCode method, and make sure they follow there contract. On the other hand if you are storing a custom object in Sorted Collection e.
Here I am listing some important java collections interview questions and answers to help you in the interview. Java 8 has brought major changes in the Collection API. Some of the changes are:. Collections are used in every programming language and initial java release contained few classes for collections: Vector , Stack , Hashtable , Array. But looking at the larger scope and usage, Java 1. Java Collections have come through a long way with the usage of Generics and Concurrent Collection classes for thread-safe operations.
In Java, collection interview questions are most asked by the interviewers. Here is the list of the most asked collections interview questions with answers. Collection Framework is a combination of classes and interface, which is used to store and manipulate the data in the form of objects. Array and Collection are somewhat similar regarding storing the references of objects and manipulating the data, but they differ in many ways. The main differences between the array and Collection are defined below:.