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Interview Questions and Answers for 'Capitalone' - 11 question(s) found - Order By Newest

Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q1. Differences between abstract class and interface ?Core Java
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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   Like         Discuss         Correct / Improve     java   classes   abstract class   interfaces     Asked in 65 Companies      basic        frequent


Very frequently asked in companies using SOA.
  Q2. What are RESTful Web Services ?Rest
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Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines -

1. http for client server communication,
2. XML / JSON as formatiing language ,
3. Simple URI as address for the services and,
4. stateless communication.

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   Like         Discuss         Correct / Improve     java   web services   rest   java   j2ee  architecture     Asked in 14 Companies      intermediate        frequent


Frequently asked to fresh graduates.
 Q3. What is ACID ?Database2016-11-04 08:09:44

Ans. ACID stands for Atomicity, Consistency, Isolation, Durability is a set of properties of database transactions.

Atomicity means all or nothing. i.e parts of a transaction shouldn't commit if any one of them fails. Either the whole transaction should succeed or it should be complete rollback.

Consistency means that any transaction should lead database from one stabe state to another.

Isolation means that the execution of transaction results in a system state that would be obtained if transactions were executed serially.

Durability means that when a transaction is committed it forms the permanent state of database.

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   Like         Discuss         Correct / Improve     database  acid     Asked in 6 Companies      Intermediate

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 Q4. Difference between PATH and CLASSPATH ?Operating System
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Ans. PATH is the variable that holds the directories for the OS to look for executables. CLASSPATH is the variable that holds the directories for JVM to look for .class files ( Byte Code ).

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   Like         Discuss         Correct / Improve     java   path   classpath   byte code   jvm   basic interview question     Asked in 3 Companies      intermediate        rare


Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.
  Q5. What is rule regarding overriding equals and hashCode method ?Core Java
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Ans. A Class must override the hashCode method if its overriding the equals method.

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   Like         Discuss         Correct / Improve     java   collections   hashcode  hash code   equals   collections     Asked in 44 Companies      intermediate        frequent

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 Q6. What is classpath in a project?Core Java
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Ans. ClassPath is the path where Java looks for class files to resolve the dependencies. For example - If you are using a class "xyz" in your code and have specified the respective import, Where should Java look for the definition of xyz. Java determines using the class path settings.

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   Like         Discuss         Correct / Improve     java   classpath   classpath settings     Asked in 2 Companies


Recently asked in Capital One.
 Q7. What will happen if we call perform(null) ?

public void perform(Object obj) {
System.out.println("Object");
}

public void perform(Integer int) {
System.out.println("Integer");
}
Core Java

Ans. compiler will throws error as ambiguous methods

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   Like         Discuss         Correct / Improve     overloading   method overloading     Asked in 1 Companies      intermediate


 Q8. What is a classpath in Java ?Core Java2016-08-14 19:27:02

Ans. Classpath is the parameter for JVM to look for java classes ( .class files ) that are to be looad by class loader

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   Like         Discuss         Correct / Improve     classpath     Asked in 1 Companies      basic


Frequently asked Design Pattern interview question.
 Q9. What is a prototype design pattern ?Design2016-11-04 08:06:01

Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects.

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   Like         Discuss         Correct / Improve     design pattern  prototype design pattern  cloning     Asked in 11 Companies      intermediate


 Q10. Write a Test Case using Mock ?Testing2016-11-04 08:13:38

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=mock&category=code

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   Like         Discuss         Correct / Improve     Junit  Mock     Asked in 1 Companies


Very frequently asked.
 Q11. What is the use of synchronized keyword ?Core Java2016-11-04 08:15:53

Ans. Synchronize is used to achieve mutual exclusion i.e at one time, the segment of the code, method that has been declared synchronized should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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   Like         Discuss         Correct / Improve     threads  multithreading  synchronized     Asked in 5 Companies      basic        frequent




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