Java Interview

How to Crack a Java Interview Easily?

By Meenakshi Agarwal
6 Min Read
Crack Java Interview Easily

Here is a simple roadmap outlining the key topics for you to acquire Java programming skills. If you grasp these topics and practice, it will not be difficult to crack a Java interview. So, if you are ready to learn, keep your focus on going through each topic one by one.

Roadmap to Crack a Java Interview

JAVA is like an ocean. It begins with the core part of the language. This includes basic programming syntax, control flow, exceptions, classes, collections, file i/o, etc. After that, you get into advanced-level concepts such as web app basics, servlets, session handling, JSP, and so on. If you have less experience, you may need to sail a bit longer in the ocean to excel.

Start Learning Core Java

Core Java is the heart of the Java programming language. You must master the underlying concepts. Some of the must-know topics are:

Basic Java Programming

Get Started with Java

Data types and Operators

    Control Flow Statements

    Object-Oriented Programming in Java

    OOP Concepts in Java

    Constructors in Java

    • What are Constructors in Java?
    • Properties of Constructors
    • Default and Parameterized Constructors
    • Rules for Constructor Implementation
    • Constructor Chaining
    • Java This vs. Super Call for Constructors

      Exceptions in Java

      • What are Exceptions in Java?
      • Need for Exceptions
      • How can Exceptions be coded in Java?
      • API hierarchy for Exceptions
      • Types of Exceptions

      More OOP Related Stuff

      • Strings in Java
      • Collection Framework in Java
      • Generics

      Input-Output in Java

      • What is the stream?
      • Bytes vs. Characters
      • Overview of the entire Java IO API
      • Read/Write file
      • Reading User input from the console
      • PrintWriter Class

      Miscellaneous Concepts

        The interviewer would likely grill you the most on the Core Java part only.

        Learn Advanced Java Skills

        Advanced Java includes higher-level and more complicated topics. You should only try these when you have got the basics right.  Some of these concepts are as follows:

        • Intro to JSP – Java Server Pages or JSP technology to connect the static HTML with the Java code for dynamic pages.
        • Intro to Servlets -Servlet is a Java class. It produces dynamic content after fulfilling the user’s request. You should learn about Servlet, its lifecycle, and its methods.
        • Session Management – How to handle a session by URL rewriting, using Cookies, and HttpSessiontechniques
        • Filters and Listeners
        • Hibernate

        Develop Framework Knowledge

        There are various readymade Java frameworks available in the market. These can help you get away with a lot of manual work.

        Some of these are Hibernate and Spring frameworks (Dependency injection, AOP.JDBC, MVC). You may go through the following topics:

        Hibernate Framework

        Introduction

        • What is the ORM principle?
        • Why ORM?
        • ORM implementations

        Hibernate Architecture

        • Introduction to Hibernate
        • Hibernate Architecture
        • What are Persistent classes?

        Hibernate CRUD

        • Setting up the Hibernate project
        • Configuring all JARs and XML files
        • Setting up a connection to DB using Hibernate
        • Performing basic CRUD operations using Hibernate API
        • Object Identity; Generator-type classes
        • Using SQL, HQL, and Criteria queries

        Mapping Collections and Associations

        • Define Sets, Map, and Lists in Hibernate
        • Association Mappings

        Hibernate Caching

        • What is caching?
        • What are the types of caching in Hibernate?
        • Explanation of various caching mechanisms in Hibernate
        • Using Hibernate Annotations (if time permits)
        • Sample example of using Hibernate Annotations

        Spring Framework

        • Intro to Spring
        • Intro to All Modules of Spring
        • Intro to Spring Framework
        • Setting up Spring Framework
        • Dependency Injection
        • Spring AOP

        Domain Knowledge to Crack Java Interview

        The following are also essential things to understand:

        • What domain are you working and what type of client,
        • Which part have you programmed in the project,
        • Which application server you are using and its version,
        • Clarity of your role in the project.

        Please also note that one step of the interview is to check your ability to use algorithms to solve real-world issues. You can prepare this and make sure to master the standard algos and data structures.

        Check out Some Bonus Resources!

        Add a few more miles to your learning expedition. Go through these posts, learn, and practice Java.

        Happy learning,
        Thanks

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        Meenakshi Agarwal Avatar
        By Meenakshi Agarwal
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        Hi, I'm Meenakshi Agarwal. I have a Bachelor's degree in Computer Science and a Master's degree in Computer Applications. After spending over a decade in large MNCs, I gained extensive experience in programming, coding, software development, testing, and automation. Now, I share my knowledge through tutorials, quizzes, and interview questions on Python, Java, Selenium, SQL, and C# on my blog, TechBeamers.com.
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