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Interview Questions and Answers - Order By Newest

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 Q721. Name few Double data types related classes and interfaces ?
Ans. http://www.buggybread.com/2015/01/java-data-types-double-classes-and.html

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   Like         Discuss         Correct / Improve     java   data types   double

 Q722. Name few float data type related classes and interfaces ?
Ans. http://www.buggybread.com/2015/01/java-data-types-float-classes-and.html

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   Like         Discuss         Correct / Improve     java   data types   float

 Q723. Name few long data type related classes and interfaces ?
Ans. http://www.buggybread.com/2015/01/java-data-types-long-classes-and.html

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   Like         Discuss         Correct / Improve     java   data types   long

 Q724. Name few Queue classes and interfaces ?
Ans. http://www.buggybread.com/2015/01/java-collections-queue-classes-and.html

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   Like         Discuss         Correct / Improve     java   collections   queue

 Q725. What are few iterator classes provided by Java ?
Ans. http://www.buggybread.com/2015/01/java-iterator-classes-and-interfaces.html

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   Like         Discuss         Correct / Improve     java   collections   iterator

 Q726. Name few classes that are part of java.lang package ?
Ans. http://www.buggybread.com/2015/01/java-javalang-classes-and-interfaces.html

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   Like         Discuss         Correct / Improve     java   java.lang

 Q727. Name few classes that are part of java.util package ?
Ans. http://www.buggybread.com/2015/01/java-javautil-classes-and-interfaces.html

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   Like         Discuss         Correct / Improve     java   java.util

 Q728. Name few Java util classes that were introduced with Java 7 ?
Ans. http://www.buggybread.com/2015/01/migrating-to-java-7-new-classes_25.html

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   Like         Discuss         Correct / Improve     java   java.util   util   java 7   java7

 Q729. Name few Java Util classes introduced with Java 8 ?Core Java
Ans. http://www.buggybread.com/2015/01/migrating-to-java-8-new-classes_25.html

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   Like         Discuss         Correct / Improve     java   java.util   util   java 8   java8

Rarely asked as it was introduced with Java 8.
 Q730. Name few java.lang classes introduced with Java 8 ?Core Java
Ans. http://www.buggybread.com/2015/01/migrating-to-java-8-new-classes.html

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   Like         Discuss         Correct / Improve     java   java.lang   java8   java 8

 Q731. How to make sure that a string contains only Numerals ?Core Java
Ans. We can use NumberUtils.isNumber which is a part of apache commons package.

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   Like         Discuss         Correct / Improve     java   apache commons   numberutils   numberutils.isnumber

  Q732. What is Jenkins ?Jenkins
Ans. It is a continuous integration tool written in Java.

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   Like         Discuss         Correct / Improve     java   jenkins     Asked in 6 Companies      Basic        frequent

 Q733. Do you know the way to remove unused imports automatically in eclipse ?Eclipse
Ans. Select the package -> Right Click -> Source -> Organize Imports.

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   Like         Discuss         Correct / Improve     eclipse   import statement   code cleaning   code review   clean code

 Q734. What is Nagios ?
Ans. Nagios is open source system , network and infrastructure monitoring software application. It alerts the user if anything goes wrong. Nagios is widely used as monitoring tool for enterprise applications.

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   Like         Discuss         Correct / Improve     production support   application support   nagios   system monitoring

 Q735. 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

 Q736. 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

 Q737. 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

 Q738. 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

Frequently asked in Tata Consultancy (TCS) interview ( Based on 2 Feedback )
 Q739. 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

 Q740. 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

 Q741. 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

 Q742. 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

 Q743. 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
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 Q744. 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.
 Q745. 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.
 Q746. 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

 Q747. 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

 Q748. 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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 Q749. 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

 Q750. 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

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