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Core java - Interview Questions and Answers for 'Capitalone' - 6 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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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.
  Q2. 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     Cognizant (CTS)  CapitalOne  Tata Consultancy (TCS)  HCL Technologies  Deloitte  Wipro  Infosys  Sabre  Sophos   Tieto  Addteq  Priceline.com  Cisco Systems  Visa Inc  Vibrant Media  Audience Science  GT Nexus  OpenCrowd  Instinet  Kronos  Elsevier  IMC Financial  LG Mobile  Dun & Bradstreet  WBUT  codecentric  Satmetrix  Interactive Brokers  Roposo  SecureView  Azuga  Envestnet  Criteo  Skillz  MobileIron  Walmart  R Systems  Overstock.com  Verilogue  Goldstone Technologies  FatWire  LinkedIn  Southwest Airlines  Crossover for Work      intermediate        frequent

Try 1 Question(s) Test


 Q3. What is classpath in a project?Core Java
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info@buggybread.com
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     CapitalOne  MathWorks


Recently asked in Capital One.
 Q4. 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     CapitalOne      intermediate


 Q5. 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     CapitalOne      basic


Very frequently asked.
 Q6. 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     CapitalOne  Deloitte  JP Morgan  Morgan Stanley  JP Morgan      basic        frequent




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