Important Questions To Prepare for Java Interview

1. Important Questions To Prepare for Java Interview Flexible and robust, Java is one of the most popular programming languages. Even in the TIOBE Index of the top 10 programming languages, Java stood firmly in the second position. Today, more than a billion computers and mobile phones run on java. Java is used in a number of applications such as desktop applications, games, mobile systems, apps, and more and is a key language for networking. The increasing popularity of Java is creating a demand for Java professionals in numerous industries. But how do you get these jobs? First, you will need to crack a Java coding test for an interview. And then prepare for the most common questions asked during a Java interview. As Java is an application programming language, the focus is primarily on the APIs, design patterns, and java concepts. TheJava interview preparation for Java EE is different from core Java preparation. Most core Java interview questions are based on Concurrency, JVM internals, and Collections. In contrast, Java EE interviews are focused upon frameworks like Spring, JSF, Hibernate, etc. The range of Java interview questions preparation varies and regularly alters because, with the release of the Java platform, the API set also grows. So, you can be asked questions about anything from the first to the most recent release. Here are some important topics that you should prepare for your next Java interview. Core Java Questions Any interviewer will start first with the core Java questions before moving to the advanced topics. The questions can range from simple object-oriented principles to commonly used Java classes such as HashMap or String. Some of the topics you should prepare are: •Best practices for object initialization

2. •How does HashMap work in Java? •What is ConcurrentHashMap? •Designing a Good Key for HashMap •Questions related to collections framework •What are polymorphism and abstraction in Java? •Difference between abstraction vs. encapsulation •Difference between interfaces and abstract classes? •Everything related to Enum. •Java serialization and serializable interface •Java main method •Object cloning in Java •What is CountDownLatch? •Why are Strings immutable? And how to make a Java class immutable? Questions Related To Concurrency Concurrency is one of the advanced and most complex topics in Java which is indeed asked in a technical interview. As multithreading and concurrency go hand in hand, these topics garner many questions. So, when you learn Java online, make sure you learn about these topics too. •What are Thread Safety and the concept of correctness? •Difference between class level and object level locking. •Difference between extends Thread and implements Runnable •What is CAS (Compare and Swap)Algorithm? •What is the Fork-Join framework?

3. •What is ThreadPoolExecutor? •How to write a deadlock source code and resolve it in Java? •Difference between the wait and sleep method in Java? Questions on Spring, Spring Core, Spring IOC Some of the interview questions on Spring you must prepare for your coming interview are: •What is the Spring configuration file? •What is IoC (Inversion of Control) Container? •What is Spring MVC architecture? •What is Spring AOP proxy? •Difference between constructor and setter injection. •What are Spring beans? •What is Spring boot? •Difference between Spring Boot and Spring? •DispatcherServlet and ContextLoaderListener As you go for experienced profiles, you can expect more advanced types of questions. During your job interview, you are not only expected to code but to know about the advanced concepts of Java and explain them eloquently. There is a huge range of online java questions, which you can prepare going through PDFs, blogs, and other resources. The best way is to look up questions that have been asked by big companies. Besides the technical questions, you will also need to work upon on your resume and learn about the company to convince that you are the most suitable candidate for them.