Java and Spring Interview Guides

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