how to crack java interviews
Java Interviews are a little bit different than traditional
programming interviews on tech giants and product based companies like Google,
Amazon, Microsoft, or Facebook. First, even though it has questions from Data
Structure and Algorithms like String or Array, you can still manage to clear
Java interviews if you are not an expert on them. The questions are a little
bit easier and more practical than those companies. Another very important
thing about Java interviews are questions based upon Java programming language
and JDK API. Since Java is also an Object-oriented programming language, you
will find lots of OOP questions there.
Since Java is primarily used as an application programming
language, the focus is aligned accordingly with questions mostly focusing on
API, Java concepts, and design patterns.
Also, Java interviews change a lot depending upon the
candidate's experience. For example, junior developers with 1 to 2 or 3 to 4
years of experience will see more questions on topics like Java fundamentals,
API, data structure and algorithms.
More senior developers like Java programmers with 5 to 6
years of experience will find more questions on concurrent programming, Java
concurrency API, JVM internals, GC tuning, and Java Performance.
So your preparation should be aligned with your experience
and not just focused on common programming questions.
Also, Java EE interviews are totally different than core
Java interviews because core Java interviews are mostly focused on core Java
concepts like Concurrency, Collections, and JVM internals, while Java EE
interviews are based upon framework like JSF, Spring, Hibernate and others.
The best way to prepare for Java interviews is to join a
course like Java Interview Guide: 200+ Interview Questions and Answers, though
there is no substitute for the experience you can still manage to sail through
by carefully preparing for your Java interviews.
Which Topics to Prepare for Java Interviews?
As I told, the importance of topics depends upon the
candidate's experience. I would ask more questions from Java fundamentals like
String, Collections, equals() and hashcode and OOP concept to a fresher or
Junior Java developers of 2 years experience, but those topics will be too
trivial for Java developer of 4 to 5 years experience.
For those, I prefer to ask Concurrency, JVM internals,
Garbage Collection, testing, and design patterns. Another thing which decides
which topic you should prepare for your interview is the Job description.
Also, there is no better guide than Job description to
prepare for relevant topics.
For example, if you are going to work for a core Java
multi-threading based application then you should prepare well for core Java
topics like multi-threading and concurrency, Java Collections, Generics, Enum,
GC Algorithms and JVM internals.
Similarly, if you are going to work for Java Web Service
application than preparing about REST and SOAP, XML, JSON, and other relevant
topics.
For Java, web application developers, JSP, Servlet, Spring,
and Hibernate are more important than multi-threading and JVM internals.
Similarly for an Android developer, apart from knowledge of Java fundamentals,
knowing Android API is more important.
Nevertheless here is the list of topics I suggest to any
Java developer who is serious about interviews.
Java Fundamentals
Object-Oriented Concepts (questions)
Data Structure and Algorithms (questions)
Multithreading, concurrency, and thread basics (questions)
Date type conversion and fundamentals (questions)
Garbage Collection (questions)
Java Collections Framework (questions)
Array (questions)
String (questions)
GOF Design Patterns (questions)
SOLID design principles (questions)
Abstract class and interface (questions)
Java basics e.g. equals and hashcode (questions)
Generics and Enum (questions)
Java IO and NIO (questions)
Common Networking protocols
Data structure and algorithm in Java (questions)
Regular expressions
JVM internals (questions)
Java Best Practices
JDBC (questions)
Date, Time and Calendar (questions)
XML Processing in Java (questions)
JUnit
Programming questions (questions)
Apart from these topics, you could also take help from books
like Java interview exposed and the Cracking the coding interview. These are
great books written especially from interview perspective and it will give you
a good idea of what to expect on Java programming job interviews.
You will also find questions asked from various tech
companies like Facebook, Google and Investment banks like Barclays, Citi,
Deutsche Bank, Morgan Stanley, and others.
For a more serious developer who wants to become an expert
and not just to focus on clearing an interview, I suggest you take a look at my
12 advanced Java books for experienced programmers article. It contains books
for every important topic in Java.
And if you lack on some topic, you can always go back to the
book you read or the course you followed to learn the Java-like The Complete
Java MasterClass course on Udemy is very comprehensive course and best for
learning from scratch.[Source]-https://javarevisited.blogspot.com/2017/01/how-to-prepare-for-java-interviews.html
We provide best java courses in mumbai, navi mumbai. We have industry experienced trainers and provide
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