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I was getting a lot of emails and comments to create java interview questions and answers PDF eBook.

Top 50 Java Collections Interview Questions and Answers

It is one of the most popular collections java collections interview questions and answers pdf download question for java developer. This eBook is sent automatically as soon as you subscribe. Vector is slow while ArrayList is fast. Q4 Which collection classes are synchronized or thread-safe? For a short time, I am giving direct download for all my newsletter subscribers to my Java Design Pattens PDF eBook that has been downloaded over 20, times.

It is one of the frequently asked collection interview questionthe main differences are Vector is synchronized while ArrayList is not. Stack, Properties collectuons, Vector and Hashtable can be used in multi threaded environment because they are synchronized classes or thread-safe. I would love to hear your thoughts and opinions on my articles java collections interview questions and answers pdf download.

I have very impressed with your posts on java and framworks. HashMap allows one null anssers and any number of null values while Hashtable does not allow null keys and null values.

But ListIterator can traverse the collection in both directions that is forward as well as backward.

So go ahead, subscribe and get this eBook too. HashMap is not synchronized or thread-safe while Hashtable is synchronized or thread-safe.

Below image shows the cover page of this eBook. Q17 What is the difference between HashMap and Hashtable?

Top 50 Java Collections Interview Questions and Answers | Java Hungry

This question checks whether student understand the concept of static and dynamic array. I subscribed and got the PDFs.

Fill the email in the forms on top collectilns or in the sidebar. Why not reach little more and connect with me directly on Google PlusFacebook or Twitter. If Queue is empty then poll method will return null. Array can contain primitive data types while ArrayList can not contain primitive data an.

Make sure you go through this once before appearing for the interview. If you have come this far, it means java collections interview questions and answers pdf download you liked what you are reading. Please keep writing new articles.

While in similar caseremove method will throw NoSuchElementException. Array is static intervew size while ArrayList is dynamic in size.

Lambda expressionsoptional classDefender methods with examples.

Both poll and remove method is used to remove head object of the Queue. Main differences dwonload HashMap and Hashtable are: Please let me know if you have interview questions for 8 yrs experienced. If queue is empty then peek method also returns null. This is to avoid spam subscriptions. Checked even in spam and promotional tab.

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Java Interview Questions and Answers PDF eBook Free Download (250+ Questions, 60 Pages)

Just subscribe to my newsletter and you will get this eBook first thing in the email. You will get an email to confirm your subscription.

Please check your email Promotions tab, Spam etc. For more java articles ,Click here to Subscribe JavaHungry. First Non repeated character in Odwnload Count total number of times each alphabet appears in the string java program code with example Java 8 new features: Q19 What is the difference between Iterator and ListIterator.