Top 10 Java interview questions and Answers

Top 10 Java interview questions and Answers

Java is one of the most popular programming languages among developers. Its uncomplicated syntax and compatibility with all the major operating systems makes it an ideal choice. Today, there are more than 15 million developers who work with the Java language.

With competition this intense, organizations hiring Java developers are quite resolute in their hiring priorities. Only professionals with proven technical competencies in Java and who can design, code, build, and deploy any kind of applications are hired.

But no matter how great your coding skills, acing the interview is essential to land the Java role of your dreams.

We’ve compiled 10 of the top questions and model answers often asked at Java Developer interviews – read on to find out where you stand!

Core Java Interview questions

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Top 10 Core Java Interview Questions

  1. How is Java platform independent?
  2. List any five features of Java?
  3. Differentiate between JDK, JRE and JVM.
  4. What does super keyword do?
  5. Why pointers are eliminated from java
  6. Why multiple Inheritance is not supported by Java?
  7. Explain finally keyword in java?
  8. Explain the creation of a thread-safe singleton in Java using double-checks locking
  9. What are checked and unchecked exceptions?
  10. What is the difference between an Abstract class and Interface?

Top 10 JDBC-Java Interview Questions

  1. What are common JDBC Exceptions?
  2. What is the different between ResultSet and RowSet?
  3. What is JDBC Connection isolation levels?
  4. What is JDBC Savepoint? How to use it?
  5. What is the use of setFetchSize() and setMaxRows() methods in Statement?
  6. How to get the Database server details in java program?
  7. What is serialization
  8. How can we execute stored procedures and functions?
  9. What are different types of JDBC Drivers?
  10. How can we store and retrieve images from the database?

Top 10 Servlet Interview Questions 

  1. What are different ways for servlet authentication?
  2. What are important features of Servlet 3?
  3. What is a deployment descriptor?
  4. How does Cookies work in Servlets?
  5. What are life cycle methods of a servlet?
  6. What is the inter-servlet communication?
  7. What is SingleThreadModel interface?
  8. What is ServletContext object?
  9. What are the advantages of Servlet over CGI?
  10. What is different between web server and application server?

Top 10 Hibernate Interview Questions

  1. How to implement relationships in hibernate?
  2. What is HQL and what are it’s benefits?
  3. What are the benefits of Named SQL Query?
  4. How to implement Joins in Hibernate?
  5. What is use of Hibernate Session merge() call?
  6. Hibernate SessionFactory is thread safe?
  7. What is hibernate configuration file?
  8. How primary key is created by using hibernate?

Top 10 Spring Interview Questions

  1. What is ContextLoaderListener?
  2. What is ViewResolver in Spring?
  3. How to upload file in Spring MVC Application?
  4. What is Spring Bean life cycle?
  5. What is Spring IoC Container?

Frequently Asked Java Questions (2018)

Q) Is Java platform independent?  (April TCS,Cerner,Wipro,Sap)
Yes. Java is a platform independent language. We can write java code on one platform and run it on another platform. For e.g. we can write and compile the code on windows and can run it on Linux or any other supported platform. This is one of the main features of java.

Q) Why can’t I do myArray.length () ? Arrays are just objects, right?(2018  TCS,Sap,Trigent,Infosys)
Yes, the specification says that arrays are object references just like classes are. You can even invoke the methods of Object such as toString () and hashCode () on an array. However, length is a data item of an array and not a method. So you have to use myArray.length.

Q) Four main principles of OOPS language?(2018 iGATE Patni, TCS, Sap,Trigent, Infosys, Sonata Software Ltd,Tech Mahindra)

  • Inheritance
  • Polymorphism
  • Data Encapsulation
  • Abstraction

Q) What is static and dynamic binding?(2018  TCS,Sap,Trigent,Infosys,Sonata Software Ltd,Tech Mahindra)
Binding refers to the linking of method call to its body. A binding that happens at compile time is known as static binding while binding at runtime is known as dynamic binding.

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Top 10 Java interview questions and Answers 2018 

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Java Powers Our Digital World:

 

  •  Java is a programming language and computing platform first released by Sun Microsystems in 1995.
  •  Simple, Platform Independent, Architectural Neutral , Dynamic and Extensible,Portable, Multi Threading, Distributed, Networked, Robust, Secured, High Performance, Object Oriented

JAVA INTERVIEW QUESTIONS:

Java is one of the most popular programming languages among developers. Its uncomplicated syntax and compatibility with all the major operating systems(Unix,WIN,Android,IOS) makes it an ideal choice. Today, there are more than 20 million developers who work with the Java Programming language.

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