![]() ![]() What’s the difference between String, StringBuffer, and StringBuilder? Try HireAI and hire top developers now → Basic Java Interview Questions 1. ![]() ⚡️ Hire 4x faster with vetted candidates (qualified and interview-ready) ⚡️ Identify top applicants from our network of 250,000+ devs with no manual screening ⚡️ Get instant candidate matches without searching Looking to hire the best remote developers? Explore HireAI, your personal AI recruiter, and see how you can: Here are some Java interview questions that you can ask a developer to evaluate their understanding of the language. Optimize your software development capabilities by adding top talents from one of the leading outsourcing companies in the world let our experience work for you.Need to interview a Java developer for a freelance project or job? Here are 37 essential Java interview questions and answers provided by some of our top Java experts here at Arc.Īlthough technical interviews can’t gauge how well a candidate would perform on a real-life project, this is still an integral part of the hiring process. When asked this senior Java developer interview question, experienced candidates may also want to describe one of the hardest performance issues they have faced, or trivial issues that can be easily avoided by adopting a series of good practices and keeping an eye on performance during the whole development lifecycle. Identification of the precise piece of the business logic to optimize may occur manually by inserting logs measuring time, or by using profiling tools that automatically decouple the various pieces of the flow measuring time spent in the execution. Only then can an optimization make any sense, otherwise the enhancement cannot be measured. ![]() The first step in identifying and resolving a performance issue is measuring the actual performance of the behavior. Identifying the root cause of the issue can be difficult, so this is a good interview question for experienced candidates. Typically, performance issues are reported by testers or users sometime after a feature has been shipped to production. Is there any difference between creating a local git branch and a git stash? Finding an answer can be a great exercise for candidates. While it’s possible to create multiple stashes at once by giving them different names, it’s usually better to not have more than one stash, as things can become complex to restore. Stashing is a powerful tool to put aside code that you just wrote, without pushing it to any remote tracked branch. Instead of having branches intersect multiple times, you can have a clean Git history, as long as everyone follows the golden rule of rebasing: never rebase a public branch. Rebasing means to move the base of a branch on top of the leaf of another. A rebase may be needed when reserving a clean Git history is important. When it’s not possible to merge two branches because of conflicts, developers have two options: merging or rebasing. In the beginning, the lack of knowledge made it seem worse. Using Git improved the game, but we all needed some experience with it. I still remember the early years of programming as a nightmare, when we used SVN in a team of 10 people. Algorithms and data structures are the base of our job, so be prepared to dig deep into those. Don’t focus only on what already-made structure is the best one for a specific task. You can be sure that JDK has the best implementation for the Java language. The best way to prepare for this question is to decompile the JDK code and see what's inside with your own eyes. One of the best senior Java developer interview questions I’ve received in my years as a software developer was to implement an ArrayList and a LinkedList from scratch, using only standard Java primitives and no Java fancy collections. This means that choosing the correct structure depends on the use case, as the performance may vary greatly depending on this. While ArrayList is based on an auto-resizable array, LinkedList uses pointers to the next and previous elements, building a chain of elements to grant access to data. The internals of the two collections differ a lot. The main difference is that LinkedList additionally implements the Deque interface, so developers can use it as a standard FIFO-like structure. As a senior Java developer, you should be able to dig deep into understanding how these structures work and how they differ.įirst of all, you should be aware that they both implement the List interface, an abstract structure built to maintain the ordering of the elements inserted. ArrayList and LinkedList are one of the most used Java structures (since Java 1.2) for day-to-day development tasks.
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