Top Java Interview Questions You Must Be Prepared For

What is Java?

Java is a programming language which has an ability to produce applications for multiple platforms. Java is a high-level programming language developed by Sun Microsystems. There are a lot of applications and websites which does not work unless there is Java installed. It is reliable, fast and secure, that’s it’s a choice of developers and hubs. Java is everywhere. If you look by examples, It is present in Laptops, supercomputers, data centers, cell phones, internet, and almost everywhere. Java is a free download software which is available here.

What is Java Certification?

Java certification is the certificate to prove one as, “Oracle Certified Java Programmer”. Since the takeover by Oracle, one must complete two different Java programmer exams to be regarded as an Oracle Certified Java Programmer. The two different java programming exams are below.

  • First Exam
    Java SE 8 Programmer I
  • Certification Name
    Oracle Certified Associate (Java SE 8 Programmer)
  • Prerequisite:
    No prerequisite
  • Second Exam
    Java SE 8 Programmer I
  • Certification Name
    Oracle Certified Professional (Java SE 8 Programmer)
  • Prerequisite
    Java SE 8 Programmer (Oracle Certified Associate ) is a general prerequisite

Since Java is a widely used programming language, this is the reason why java certification is the most on demand certification in the field of programming language.

When is Java Interview Necessary?

Java interview is necessary when you are applying a new position as a java developer or when somebody wants to test your knowledge in Java, they may take your interview to check your general knowledge on Java programming language.

Most common Java interview questions

java interview

We have compiled some basic level java interview questions below to make your java interview easier. Below are the most commonly asked java interview questions. The question list may help you in preparing for your next job interview for java developer position.

A) Basic Java Interview Questions

1.Explain JRE, JDK, and JVM.
2.Explain public static, void main and String args[].
3.Why Java is platform independent?
4.Why java is not 100% Object-oriented?
5.What are wrapper classes?
6.What are constructors in Java?
7.What is singleton class and how can we make a class singleton?
8.What is the difference between Array list and vector?
9.What is the difference between equals() and == ?
10.What are the differences between Heap and Stack Memory?

B) OOPS Java Interview Questions:

1.What is Polymorphism?
2.What is runtime polymorphism or dynamic method dispatch?
3.What is the difference between abstract classes and interfaces?
4.What is method overloading and method overriding?
5.Can you override a private or static method in Java?
6.What is multiple inheritance? Is it supported by Java?
7.What is association?
8.What do you mean by aggregation?
9.What is composition in Java?

C) Servlets Interview Questions

1.What is a servlet?
2.What are the differences between Get and Post methods?
3.What is Request Dispatcher?
4.What are the differences between forward() method and sendRedirect() methods?
5.What is the life-cycle of a servlet?
6.How does cookies work in Servlets?
7.What are the different methods of session management in servlets?

D) JDBC Interview Questions

1.What is JDBC Driver?
2.What are the steps to connect to a database in java?
3.What are the JDBC API components?
4.What is the role of JDBC DriverManager class?
5.What is JDBC Connection interface?
6.What is the purpose of JDBC ResultSet interface?
7.What is JDBC ResultSetMetaData interface?
8.What is JDBC DatabaseMetaData interface?
9.What do you mean by batch processing in JDBC?
10.What is the difference between execute, executeQuery, executeUpdate?
11.What is a Spring?
12.Name the different modules of the Spring framework.
13.List some of the important annotations in annotation-based Spring configuration.
14.Explain Bean in Spring and List the different Scopes of Spring bean.
15.Explain the role of DispatcherServlet and ContextLoaderListener.
16.What are the differences between constructor injection and setter injection?
17.What is autowiring in Spring? What are the autowiring modes?
18.How to handle exceptions in Spring MVC Framework?
19.What are some of the important Spring annotations which you have used?
20.How to integrate Spring and Hibernate Frameworks?

E) Hybernate Interview Questions

1.What is Hibernate Framework?
2.What are the important benefits of using Hibernate Framework?
3.Explain Hibernate architecture?
4.What are the differences between get and load methods?
5.What are the advantages of Hibernate over JDBC?

F) JSP Interview Questions

1.What are the life-cycle methods for a jsp?
2.What are the JSP implicit objects?
3.What are the differences between include directive and include action?
4.How to disable caching on back button of the browser?
5.What are the different tags provided in JSTL?
6.How to disable session in JSP?
7.How to delete a Cookie in a JSP?
8.Explain the jspDestroy() method.
9.How is JSP better than Servlet technology?
10.Why should we not configure JSP standard tags in web.xml?

G) Exception & Thread Interview Questions 

1.What is difference between Error and Exception?
2.How can you handle Java exceptions?
3.What are the differences between Checked Exception and Unchecked Exception?
4.What purpose does the keywords final, finally, and finalize fulfill?
5.What are the differences between throw and throws?
6.What is exception hierarchy in java?
7.How to create a custom Exception?
8.What are the important methods of Java Exception Class?
9.What are the differences between processes and threads?
10.What is a finally block? Is there a case when finally will not execute?
11.What is synchronization?
12.Can we write multiple catch blocks under single try block?
13.What are the important methods of Java Exception Class?

These are the collections of most asked Java interview questions. We have collected these questions from the different sources to make your java interview easier. Apart from these Java Interview Questions, if you want to get trained from professionals on Java programming language, you can opt for a structured training from Broadway Infosys Nepal.

So this brings us to the end of the Java interview most asked questions. The questions that we covered in this Java Interview Questions are the most sought-after skill sets that recruiters look for in a Java Professional. These set of Questions will definitely help you face your job interview in java programmer job position. We wish you Good luck for your interview.

Check out the Java training by Broadway Infosys Nepal, a trusted and top computer institute in Nepal.

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