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Interview Questions and Answers - Order By Newest

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 Q691. What you do when you see a broken build for your project in Jenkins ?Jenkins
Ans. I will open the console output for the build and will try to see if any file changes were missed.
If not able to find the issue that way, Will clean and update my local workspace to replicate the problem on my local and will try to solve it.

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   Like         Discuss         Correct / Improve     java   jenkins

 Q692. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
Ans. No, if required we should only have final variables.Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too.

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   Like         Discuss         Correct / Improve     java   singleton   spring framework   spring beans

 Q693. What is the difference between Fisheye and Crucible ?
Ans. FishEye is used to extract information from source code repository whereas Crucible is used to request, perform and manage code reviews.

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   Like         Discuss         Correct / Improve     java   fisheye   crucible   code review   tools

 Q694. Can we use Fisheye and Crucible independently ?
Ans. Yes

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   Like         Discuss         Correct / Improve     java   fisheye   crucible   code review   tools   yes-no

 Q695. What does the red and green line backgrounds denotes in the crucible code Review ?
Ans. Red Background for a line denotes the lines that have been deleted with the change set and Green background denotes the addition.

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   Like         Discuss         Correct / Improve     java   crucible   fisheye   code review

 Q696. What is atlassian Jira ?
Ans. Jira is a Issue / Ticket Management system developed by atlassian. It assists in Defect Management , Issue Management and Project Management.

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

Frequently asked in Tata Consultancy (TCS) interview ( Based on 2 Feedback )
 Q697. What are the technologies used in Jira ?Tools
Ans. JIRA is written in Java and uses the Pico IOC container,Apache OFBiz entity engine, and WebWork technology stack. For remote procedure calls (RPC), JIRA supports REST, SOAP, and XML RPC.

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management     Asked in 5 Companies      expert

 Q698. Which are SCM's can be integrated with Jira ?
Ans. Clearcase, CVS, Git, Mercurial, Perforce, Subversion and Team Foundation Server

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

 Q699. What are the different types of boards in Jira ?
Ans. Scrum boards are for teams that plan their work in Sprints.

Kanban boards are for teams that focus on managing and constraining unplanned work.

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

 Q700. What is a Board in Jira ?
Ans. We need a board to work with issues in JIRA Agile. A Board can display issues from one or more projects.

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

 Q701. What is Jira Workflow ?
Ans. A JIRA workflow is the set of statuses and transitions that an issue goes through during its lifecycle.

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

 Q702. What is the Jira workflow used in your project ?
Ans. We are using the following workflow with the following Issue states

Open -> Assigned -> In Progress -> QA -> Resolved -> Closed

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   Like         Discuss         Correct / Improve     java   jira   issue management   defect management

 Q703. What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?Object Oriented Programming
Ans. Stateless objects are the objects without instance fields (instance variables). The class may have compile time constants i.e static final fields.Immutable objects are the objects which have state but the state cannot be changed after initialization. Both are Thread safe.

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   Like         Discuss         Correct / Improve     java   stateless objects   immutable  immutability objects   objects   singleton scope

 Q704. What are advantages of stateless and / or immutable objects ?Object Oriented Programming
Ans. They can be shared across multiple threads as they are thread safe.

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   Like         Discuss         Correct / Improve     java   stateless objects   immutable  immutability objects   objects

 Q705. Write code explaining use of Scanner class ?
Ans. Scanner sc = new Scanner(System.in);
int i = sc.nextInt();

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   Like         Discuss         Correct / Improve     java   scanner   io   console io   scanner   System.in

 Q706. Write program for input: I am a boy, output: I1 am2 a1 boy3?
Ans. public static void main (String args[]) {
String inputStr = "I am a boy, output: I1 am2 a1 boy3";

String splitStr[] = inputStr.split(" ");

String outputStr = new String();

for(String str1: splitStr){
outputStr += str1 + str1.length() + " ";
}

System.out.println(outputStr);
}

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   Like         Discuss         Correct / Improve     java   coding

 Q707. In which cases isn't instanceof operator a bad practice?Core Java
Ans. To avoid ClassCastException.

Though the following code will compile fine but will result in ClassCastException during runtime.

Fruit fruit = new Apple();
Banana banana = Banana(fruit); // ClassCastException


This code will not give compile time error as Banana and Fruit are related as Banana either extends or implement Fruit, So downcasting is acceptable. With this code we assume that the Fruit handler will have the Apple object at that point, violating which the code will throw the exception.

This exception can be avoided by following code.

Fruit fruit = new Apple();
if(fruit instanceOf Banana){
Banana banana = Banana(fruit); // ClassCastException
}

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   Like         Discuss         Correct / Improve     java   instanceof   classcastexception   runtime exceptions  instanceOf operator
Try 2 Question(s) Test

 Q708. Difference between Scanner and BufferedReader ? Which one is faster and Why ?Core Java
Ans. Scanner is used for parsing tokens from the contents of the stream while BufferedReader just reads the stream.

BufferedReader read files efficiently by using a buffer to avoid physical disk operations.

Buffer size of Scanner is usually smaller than the Buffered Writer.

BufferedReader is faster that Scanner as it just reads the Stream and doesn't Parse the tokens to read the stream into primitive data types.

  Sample Code for Scanner

  Sample Code for BufferedReader

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   Like         Discuss         Correct / Improve     java   file io   input output   scanner   bufferedreader  file handling

Rarely asked as it was introduced with Java 8.
 Q709. What is DocLint in Java 8 ?Core Java
Ans. DocLint Provide a means to detect errors in Javadoc comments early in the development cycle and in a way that is easily linked back to the source code.

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   Like         Discuss         Correct / Improve     java   java 8   doclint   java8 features

Rarely asked as it was introduced with Java 8.
 Q710. What are the errors identified by DocLint ?Core Java
Ans. Bad syntax, such as unescaped characters or unmatched parentheses

Bad HTML, such as invalid or missing tags or attributes

Bad references, such as referencing a non-existent type with @see

Accessibility errors, such as a missing summary or caption from a table

Missing info, such as an undocumented parameter

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   Like         Discuss         Correct / Improve     java   java8   java 8   doclint

 Q711. Why Java uses Unicode System ?Core Java
Ans. Before Unicode there were many language / country standards like ASCII , ISO , KOI and BIG 5. In order to accommodate multiple language letters and to overcome problems with using different multiple standards , a new language standard was developed i.e unicode system.

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   Like         Discuss         Correct / Improve     java   unicode

 Q712. What is the difference between out.println(a+b); and out.println (a+" " +b); in Java? with a=2 and b=1Core Java
Ans. First will give the ouput as 3 and the second will give output as 2 1

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   Like         Discuss         Correct / Improve     java   system.out.println   coding

 Q713. Which sorting algorithm is used by Collections.sort() in Java ?Core Java
Ans. The sorting algorithm is a modified mergesort. This algorithm offers guaranteed n log(n) performance.

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   Like         Discuss         Correct / Improve     java   algorithm   collections   collections.sort   sorting algorithm      expert
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 Q714. What doesn Http keep alive header does ?Java EE
Ans. Http is connection less by default. header informs hosts to keep the connection alive so that the same connection can be reused for multiple communication.

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   Like         Discuss         Correct / Improve     java   http   http-alive   client server communication

 Q715. What is the difference between Data Type and Data Structure ?Core Java
Ans. Data type: a set of values together with operations on that type
Data structure: a physical implementation of a data type

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   Like         Discuss         Correct / Improve     java   oops   data structure   data type

 Q716. Is it correct to say that Interfaces are abstract data types ?
Ans. No.

Data Type holds data whereas Interface doesn't hold anything. Interface is a contract about how to communicate with the underlying Class.

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   Like         Discuss         Correct / Improve     java   interface   data type

 Q717. Do you see Class as a Data Type or Data Structure ?
Ans. Class can be better seen as Data Type. This could be implemented as a Data Structure too in some cases.

One thing worth understanding here is that Data type and Data structure are conceptual things. Class could be implementation of either of these.

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   Like         Discuss         Correct / Improve     java   oops   class   data type   data structure

 Q718. How many elements will be there in TreeSet after the last line and Why ?

TreeSet set = new TreeSet();
set .add(new String("abc"));
set .add(new String("abc"));		Core Java
Ans. One.

As we haven't specified the type of TreeSet, it being evaluated with the first element insertion. Once it's identified that it's of type String and as no comparator has been defined, the comparison is done using the String compareTo method. String compareTo method compares the elements by the content / value.

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   Like         Discuss         Correct / Improve     java   set   treeset   string   compareto   coding   code

 Q719. Which of the following data type you will prefer to store price - BigDecimal or Double ?
Ans. BigDecimal if memory and Performance is not critical concern, otherwise double.

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   Like         Discuss         Correct / Improve     java   data types   double   bigdecimal

 Q720. Which takes more memory - float or Float ?Core Java
Ans. float is a native data type whereas Float is a class. A Float object will always take more memory than float variable as there are metadata overheads with the objects.

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   Like         Discuss         Correct / Improve     java   data type   float     Asked in 3 Companies      basic        frequent

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