Interview Questions and Answers for 'Build' | Search Interview Question

Interview Questions and Answers for 'Build' - 43 question(s) found - Order By Rating

Q1. What will you do if your build fails and you need to fix it in an hour ?

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Q2. What is the difference between Maven and Jenkins ?

Tools

Ans. Maven is a build tool whereas Jenkins is continuous integration system.

Maven deals with application compilation, build and packaging whereas Jenkins tracks SCM for triggering builds and packages, triggering parent project builds upon dependencies, initiating builds and performing alerts. So Jenkins is kind of a wrapper around SCM and Build Tool for continuous integration and deployment.

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Q3. Do we have a method to reverse a string in String class ?

Core Java

Ans. No but we have it in StringBuilder.

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Q4. Can StringBuffer and StringBuilder in Java be inherited?

Core Java

Ans. No, they have been declared final and hence cannot be extended.

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Q5. What are the daily activities of build and release engineer ?

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Q6. What is Maven ?

Maven

Ans. Maven is a build automation tool used primarily for Java projects.

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Q7. What is meant by following error ?

Source folder is not on the Java build class path

Core Java

Ans. It means that the respective folder is not looked upon by Java to look for java or resource files and hence not being included as part of build.It needs to be added to Java Build Path.

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Q8. Write a class explaining builder pattern ?

Design

Ans.

public class BuggyBread { 



   private String element1; 



   private String element2; 



   private BuggyBread(String element1, String element2){ 

      this.element1 = element1; 

      this.element2 = element2; 

   } 



   public static class Builder { 

    

      private String element1; 



      private String element2; 



      Builder(BuggyBread buggybread){ 

         element1 = buggybread.element1; 

         element2 = buggybread.element2; 

      } 



      Builder withElement1(String element1){ 

         this.element1 = element1; 

         return this; 

      } 



      Builder withElement2(String element2){ 

         this.element2 = element2; 

         return this; 

      } 



      BuggyBread build(){ 

         BuggyBread buggybread = new BuggyBread(element1,element2); 

         return buggybread; 

      } 

   } 

}

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Q9. What is a publisher in Jenkins ?

Jenkins

Ans. A publisher is part of build process that reports whether the build is stable or not. For example - Junit Test report publisher.

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Q10. What are Node / Slaves in Jenkins ?

Jenkins

Ans. Slaves are computers that are set up to build projects for a master.

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Q11. What is a stable build ?

Jenkins

Ans. A build is considered stable if it was built successfully and no publisher reports it as unstable.

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Q12. What is the upstream and downstream project in Build Systems ?

Jenkins

Ans. Upstream project is a project whose successful build is required for executing the existing project build whereas Downstream project is the one that is waiting for the upstream project to build as it has the upstream project as dependency.

For example - X project has an upstream project y and downstream project Z. So It means X has dependency Y and is a dependency for Z.

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Q13. What is the difference between broken and unstable build ?

Jenkins

Ans. Broken Build means as unsuccessful build whereas unstable build means build was created successfully but one of the Post Build report failed or could be a Test failure.

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Q14. What is multilevel inheritance ?

Core Java

Ans. Multi Level Inheritance is multi level hierarchy of classes. Here is the example - http://www.buggybread.com/2015/09/java-se-class-diagram-classes-that_603.html

Class RoleList extends ArrayList which in turn extends AbstractList which in turn extends AbstractCollection.

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Q15. Is tomcat an application or Web server ?

Server

Ans. Tomcat is a web server and a Servlet container. It is often used as an application server for web-based applications but does not include the complete suite of capabilities that a Java EE application server would supply.

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Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations.

Q16. Difference between StringBuffer and StringBuilder ?

Core Java

Ans. StringBuffer is synchronized whereas StringBuilder is not.

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Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS)

Q17. Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?

Core Java

Ans. If the Object value will not change, use String Class because a String object is immutable.

If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster).

If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized).

Sample Code for String

Sample Code for StringBuffer

Sample Code for StringBuilder

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Q18. Difference between Factory and Builder Design Pattern ?

Design

Ans. Builder pattern is the extension of Factory pattern wherein the Builder class builds a complex object in multiple steps.

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Q19. Difference between Builder and Composite ?

Ans. Builder is a creational Design Pattern whereas Composite is a structural design pattern. Composite creates Parent - Child relations between your objects while Builder is used to create group of objects of predefined types.

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Q20. What is the best practice configuration usage for files - pom.xml or settings.xml ?

Maven

Ans. The best practice guideline between settings.xml and pom.xml is that configurations in settings.xml must be specific to the current user and that pom.xml configurations are specific to the project.

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Q21. How can I change the default location of the generated jar when I command "mvn package"?

Maven

Ans. By default, the location of the generated jar is in ${project.build.directory} or in your target directory. We can change this by configuring the outputDirectory of maven-jar-plugin.

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Q22. What is Maven's order of inheritance?

Maven

Ans. 1. parent pom
2. project pom
3. settings
4. CLI parameters

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Q23. What is a Mojo?

Maven

Ans. A mojo is a Maven plain Old Java Object. Each mojo is an executable goal in Maven, and a plugin is a distribution of one or more related mojos.

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Q24. How do I determine which POM contains missing transitive dependency?

Maven

Ans. run mvn -X

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Q25. Difference between Encapsulation and Data Hiding ?

Ans. Data Hiding is a broader concept. Encapsulation is a OOP's centri concept which is a way of data hiding in OOP's.

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Q26. Difference between Abstraction and Implementation hiding ?

Ans. Implementation Hiding is a broader concept. Abstraction is a way of implementation hiding in OOP's.

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Q27. Write a method to check if input String is Palindrome?

Core Java

Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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Q28. What is the difference between compile and install ?

Maven

Ans. Compile compiles the source code of the project

whereas

Install installs the package into the local repository, for use as a dependency in other projects locally

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Q29. What is the use of !! command ? Can I use it with conjunction to some other string to complete a command ?

Unix

Ans. Its used to execute last command. Yes this can be used with other string to execute new command. For eg - if ls was the last command, We can execute !! -l for having the long listing.

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Q30. What is a transitive dependency ? Can we override Transitive Dependency version and If Yes, how ?

Maven

Ans. Transitive dependency is the dependencies not defined directly in the current POM but the POM of the dependent projects.

Yes we can override transitive dependency version by specifying the dependency in the current POM.

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