adding, changing, or removing any key-value pair. The real problem starts when at least one of that thread is updating HashMap, i.e. One example of this is a Map that contains configuration properties. For example, if you initialize a HashMap by just one thread and then all threads are only reading from it, then it’s perfectly fine. Question 1: What’s wrong using HashMap in the multi-threaded environment? When get() method go to the infinite loop? ( answer)Īnswer: Well, nothing is wrong it depends upon how you use. Without wasting any more of your time, here is my list of some of the frequently asked core Java interview questions from interviews. You can join Medium here 20+ Java Interview Questions With Answers Once you have done those, you would be more confident to given any Java interview, be it a phone interview or face-to-face.Īnyway, without wasting any more of your time, let’s dive into some of the standard Java interview questions from banks, which I have collected from some of my friends and colleagues who appeared on interviews of these banks.Īnd, if you are not a Medium member then I highly recommend you to join Medium and read great stories like this from great authors on different field. If you like to read books, you can also check Grokking the Java Interview book where I have shared many such questions and you can even use friends20 code to get 20% discount now. BTW, the more you prepare, the better your preparation will be.ītw, if you think 21 is not enough and you need more than check out these additional 40 Java questions for the telephonic interview and these 200+ Java questions from the last five years as well. It’s not guaranteed that you will get these questions, most likely, you won’t, but this will give you enough idea of what kind of questions you can expect. Yes, these questions are not for freshers or 1 to 2 years of Java experienced professional as often banks don’t hire them via open interviews they mostly join as graduate trainees. In this article, I’ll share a couple of frequently asked questions from investment banks to Java developer of more than three years of experience. still, many of them don’t have any idea of what kind of questions they can expect there. There are a lot of Java developers trying for Java development roles on Investment banks like Barclays, Credit Suisse, Citibank, etc.
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