interview-guide icon indicating copy to clipboard operation
interview-guide copied to clipboard

verified publisher icon in28minutes
→

Metadata

Java interview guide - 200+ Question and Answers

Java and Spring Interview Guides

Image

Image

Useful interview resources

  • Lambda Expressions and Streams : https://www.youtube.com/watch?v=7YBPb64h2l4
  • Java MultiThreading : https://www.youtube.com/watch?v=AfVbJDr-8ic
  • Java Interview Questions and Answers : https://www.youtube.com/watch?v=5aHZABb1Iwk
  • Java Collections Interview Questions and Answers : https://www.youtube.com/watch?v=3hgYHXDVh-o
  • Exception Handling : https://www.youtube.com/watch?v=wj3UmzeyrvE
  • JUnit : https://www.youtube.com/watch?v=o5k9NOR9lrI
  • Design Patterns : https://www.youtube.com/watch?v=f5Rzr5mVNbY
  • Eclipse : https://www.youtube.com/watch?v=s4ShbtOHMCA
  • Mockito : https://www.youtube.com/watch?v=d2KwvXQgQx4
  • Spring MVC : https://www.youtube.com/watch?v=BjNhGaZDr0Y
  • JSP Servlets : https://www.youtube.com/watch?v=Vvnliarkw48
  • Spring : https://www.youtube.com/watch?v=24rGqtxuLhc
  • OOPS : https://www.youtube.com/watch?v=yJ5RSEZS9oA
  • Maven : https://www.youtube.com/watch?v=0CFWeVgzsqY
  • https://github.com/in28minutes/Java-EE-Design-Patterns/blob/master/JavaEE%20Design%20Patterns%20and%20Architecture%20-%20Presentation%20v0.7.pdf

Our Best Free Courses

  • Spring : http://udemy.com/spring-tutorial-for-beginners/

OOPS Interview Questions

  • Code Examples : https://github.com/in28minutes/JavaObjectOrientedProgramming
  • OOPS : https://www.youtube.com/watch?v=yJ5RSEZS9oA

Advanced Java

  • Topics
    • Servlets
    • JSP
    • Spring
    • Spring MVC
    • Maven
      • What is maven? What does it do? https://github.com/in28minutes/MavenIn28Minutes
  • Videos & Presentations
    • Full Video on Design Patterns : https://www.youtube.com/watch?v=f5Rzr5mVNbY
    • Basics of Web Application : https://github.com/in28minutes/RealWorldWebApplicationWithServletsAndJspIn28Minutes/blob/master/Java%20JEE%20Web%20Applicaiton%20In28Minutes.pdf
    • Java EE Design Patterns : https://github.com/in28minutes/Java-EE-Design-Patterns/blob/master/JavaEE%20Design%20Patterns%20and%20Architecture%20-%20Presentation%20v0.7.pdf
    • Java Design Patterns : https://github.com/in28minutes/Design-Patterns-For-Beginners/blob/master/DesignPatterns-Presentation.pdf
  • RECOMMENDED COURSE
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1

Servlets

  • Reference 
    •   https://github.com/in28minutes/RealWorldWebApplicationWithServletsAndJspIn28Minutes/blob/master/Java%20JEE%20Web%20Applicaiton%20In28Minutes.pdf
    • Code : https://github.com/in28minutes/JavaWebApplicationStepByStep
    • 60 Minute Video on JSP Servlets : https://www.youtube.com/watch?v=Vvnliarkw48
  • Questions
    • If there are 1000 requests to a Servlet, how many instances of Servlet are created?
    • What is the life-cycle of a servlet?
    • Difference between Get and Post Request Methods?
    • What is difference between GenericServlet and HttpServlet?
    • What is the purpose of RequestDispatcher Interface?
    • How do you forward to a jsp from the servlet?
    • What is Session?
    • What are Cookies?
    • What is filter?
    • What is war file?
    • What is the structure of a war file?
    • What are the servlet annotations introduced in Servlet 3.0?
    • What is different between web server and application server?
    • What is difference between ServletConfig and ServletContext?
    • What is maven? What does it do? https://github.com/in28minutes/MavenIn28Minutes
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1

JSPs

  • Reference
    • https://github.com/in28minutes/RealWorldWebApplicationWithServletsAndJspIn28Minutes/blob/master/Java%20JEE%20Web%20Applicaiton%20In28Minutes.pdf
    • Code : https://github.com/in28minutes/JavaWebApplicationStepByStep
    • 60 Minute Video on JSP Servlets : https://www.youtube.com/watch?v=Vvnliarkw48
  • Questions
    • Why do we need JSPs?
    • Explain JSP Lifecycle?
    • What is difference in roles of jsp in model 1 and model 2 architectures?
    • What are different types of comments in JSP?
    • What is Scriptlet, Expression and Declaration in JSP?
    • What are JSP implicit objects?
    • What are the disadvantages of Scriptlets?
    • What is difference between include directive and jsp:include action?
    • What is JSP Expression Language?
    • What are JSP EL implicit objects?
    • What is JSTL?
    • What happens if an exception is thrown from a JSP?
    • JSP Best Practices
    • How can you avoid multiple submit problem?
  • RECOMMENDED COURSES
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1

Design Patterns

  • Resources
    • Full Video on Design Patterns : https://www.youtube.com/watch?v=f5Rzr5mVNbY
    • Java EE Design Patterns : https://github.com/in28minutes/Java-EE-Design-Patterns/blob/master/JavaEE%20Design%20Patterns%20and%20Architecture%20-%20Presentation%20v0.7.pdf
    • Java Design Patterns : https://github.com/in28minutes/Design-Patterns-For-Beginners/blob/master/DesignPatterns-Presentation.pdf
    • What are important Java EE Design Patterns? https://github.com/in28minutes/Java-EE-Design-Patterns
  • Some Creational patterns Examples
    • Factory method
      • java.util.Calendar#getInstance() & java.nio.charset.Charset#forName()
    • Prototype
      • java.lang.Object#clone()
    • Singleton
      • java.lang.Runtime#getRuntime() & java.lang.System#getSecurityManager()
  • Some Structural patterns
    • Adapter
      • java.util.Arrays#asList() & javax.xml.bind.annotation.adapters.XmlAdapter#marshal() and #unmarshal()
    • Decorator
      • All subclasses of java.io.InputStream, OutputStream etc. & java.util.Collections : synchronizedXXX() and unmodifiableXXX() methods.
    • Flyweight
      • java.lang.Integer#valueOf(int) (also on other Wrapper classes)
  • Behavioral patterns
    • Chain of responsibility
      • javax.servlet.Filter#doFilter() & Exception Handling
    • Command
      • java.lang.Runnable
    • Iterator
      • All implementations of java.util.Iterator
    • Strategy (recognizeable by behavioral methods in an abstract/interface type which invokes a method in an implementation of a different abstract/interface type which has been passed-in as method argument into the strategy implementation)
      • java.util.Comparator#compare(), executed by among others Collections#sort().
    • Template method (recognizeable by behavioral methods which already have a "default" behaviour definied by an abstract type)
      • All non-abstract methods of java.util.AbstractList, java.util.AbstractSet and java.util.AbstractMap.
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

JDBC

  • Resources
    • Video : https://www.youtube.com/watch?v=1WgsDP10iqw
  • Questions
    • When do you use JDBC?
    • Different types of JDBC Drivers
    • What is the use of JDBC API?
    • What are the steps in a simple query to database?
    • What is difference between JDBC Statement and PreparedStatement?
    • What is the difference between execute, executeQuery, executeUpdate?
    • What is a ResultSet?
    • What is the use of setFetchSize() and setMaxRows() methods in Statement?
    • What is JDBC Batch Processing?
    • What is Transaction Management?
    • What is JDBC Savepoint?
    • What is a DataSource?
    • What are the CLOB and BLOB datatypes in JDBC? Why do you use them?
    • What is DDL and DML?
    • What are JDBC Best Practices?
    • What are the other famous JDBC frameworks? How did they solve the typical problems with JDBC?
    • What is JPA? https://github.com/in28minutes/HibernateJPAStepByStep
    • What is Hibernate?
    • Hibernate interview Questions : https://www.youtube.com/watch?v=nb4kKVDc4cE
    • Introduction to Transaction Management : https://www.youtube.com/watch?v=HcjHJLEbtRs
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

J2EE

  • Resources
    • Everything from https://github.com/in28minutes/Java-EE-Design-Patterns/blob/master/JavaEE%20Design%20Patterns%20and%20Architecture%20-%20Presentation%20v0.7.pdf
  • Questions
    • What is JEE?
    • What are tomcat, web sphere and web logic?
    • What is war?
    • What is ear?
    • What are containers? what are the different types of containers?
    • What is Java EE api? https://docs.oracle.com/javaee/7/api/
    • Java EE 7 contains 14 new and updated JSRs. Java specifications are available at http://www.jcp.org.
    • JSR 338: Java Persistence API 2.1
    • JSR 339: Java API for RESTful WebServices2.0
    • JSR 340: Java Servlet 3.1
    • JSR 341: Expression Language 3.0
    • JSR 342: Java Platform, Enterprise Edition 7
    • JSR 343: Java Message Service 2.0
    • JSR 344: JavaServer Faces 2.2
    • JSR 345: Enterprise JavaBeans 3.2
    • JSR 346: Contexts and Dependency Injection for JavaEE 1.1
    • JSR 349: Bean Validation 1.1
    • JSR 352: Batch Applications for the Java Platform 1.0
    • JSR 353: Java API for JSON Processing 1.0
    • What is JPA? https://github.com/in28minutes/HibernateJPAStepByStep
    • What are important Java EE Design Patterns? https://github.com/in28minutes/Java-EE-Design-Patterns
    • What is maven? What does it do? https://github.com/in28minutes/MavenIn28Minutes
    • Introduction to Transaction Management : https://www.youtube.com/watch?v=HcjHJLEbtRs
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

Maven

  • Resources
    • https://github.com/in28minutes/MavenIn28Minutes
    • Maven : https://www.youtube.com/watch?v=0CFWeVgzsqY
  • Questions
    • What is Maven? What does maven do? https://github.com/in28minutes/MavenIn28Minutes#0-what-is-maven
    • What is the power of Maven? https://github.com/in28minutes/MavenIn28Minutes#what-is-the-power-of-maven
    • Maven Full Course : https://www.youtube.com/watch?v=0CFWeVgzsqY
    • What is Conventions over Configuration?
    • What is the difference between Ant and Maven?
    • What is the standard maven folder structure?
    • What is a Local Repository?
    • What is a transitive dependency?
    • What is a dependency exclusion?
    • What is dependencyManagement?
    • How do you add code quality checks to your maven lifecycle?
    • Why do we use Maven Plugins?
    • What is Maven Build Lifecycle?
    • What are the different types of artefacts that can be produced using a maven pom?
    • What is a profile?
    • What is a SNAPSHOT?
    • What are maven properties?
    • What is a maven archetype?
    • What are maven best practices?
    • What is a maven release?
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

Eclipse

  • Resources
    • https://github.com/in28minutes/EclipseIn28Minutes
    • Eclipse : https://www.youtube.com/watch?v=s4ShbtOHMCA
  • Questions
    • What is an IDE?
    • What is an workspace?
    • What are views?
    • What are perspectives?
    • Integration with Maven Full Course : https://www.youtube.com/watch?v=0CFWeVgzsqY
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

Jenkins

  • Resources
    • https://ci.jenkins-ci.org/job/Core/job/jenkins/job/master/ & https://builds.apache.org
    • http://jenkins-le-guide-complet.github.io/html/sect-first-steps-first-job.html
    • http://www.javainterview.in/p/continuous-integration-interview.html
  • Questions
    • What is Jenkins?
    • What is continuous integration?
    • How do you create a new project in Jenkins?
    • What are typical builds that you would create in Jenkins?
    • What is maven? What does it do? https://github.com/in28minutes/MavenIn28Minutes
    • Maven Full Course : https://www.youtube.com/watch?v=0CFWeVgzsqY
  • RECOMMENDED COURSES
    • Java EE Patterns : https://www.udemy.com/java-ee-design-patterns-architecture-and-frameworks/?couponCode=JEEPATTERNS-UTUBE-1
    • Maven : https://www.udemy.com/learn-maven-java-dependency-management-in-20-steps/?couponCode=MAVEN-UTUBE-1
    • Spring MVC : https://www.udemy.com/spring-mvc-tutorial-for-beginners-step-by-step/?couponCode=SPRNGMVC-UTUBE-1
    • JSP Servlets : https://www.udemy.com/learn-java-servlets-and-jsp-web-application-in-25-steps/?couponCode=JSPSRVLT-UTUBE-1

For Later

  • Git
  • Selenium
  • JavaScript
  • JQuery
  • JUnit

← Metadata

294
Stars
217
Forks
Watchers

Owner

verified publisher icon in28minutes

Metadata

Java interview guide - 200+ Question and Answers

Back