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Interview Questions and Answers for 'Visa Inc' - 5 question(s) found - Order By Newest

This question can be asked in different variants like performace improvement of an application, improving performance for DB communication etc.
 Q1. What are the ways in which execution time of the code can be improved ?Solution2016-05-29 09:42:39

Ans. This depends on entirely upon the code type. For example

1.If its just logic, we can try it to short circuit or put the if / switch case with maximum probability in the beginning.

2. Can use faster data structures, for eg - random retrieval instead of sequence / iterator

3. Working with primitive types or even bytes instead of Objects, even though it may result in marginal improvement.

4. If its service call, then service call with bulk load can help

5. If DB Operation, then with use of Indices , Views or using ORM , cache etc.


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   Like      Discuss      Correct / Improve     performance improvement  code optimization     Visa Inc


  Q2. Explain static blocks in Java ?Core Java
Anonymous
Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example:

static {
// whatever code is needed for initialization goes here
}

A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code.

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   Like      Discuss      Correct / Improve     java   oops   static   static block     Daffodil  Visa Inc  Logica  DataMetica  Tech Mahindra  Nagarvision  3i infotech  CA Technologies  HexaView Technologies  Propellum Infotech  DataMetica  VMC Consulting  Tavant  Novelvox  InfoGain  Datamatica      basic        frequent


  Q3. Advantage of Collection classes over Arrays ?Core Java
Admin
info@buggybread.com
Ans. Collections are re-sizable in nature. We can increase or decrease the size as per recruitment.
Collections can hold both homogeneous and heterogeneous data's.
Every collection follows some standard data structures.
Collection provides many useful built in methods for traversing,sorting and search.

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   Like      Discuss      Correct / Improve     java   collections   collections classes   advantages of collections over arrays   collections vs arrays   basic interview question     Nous Infosystems  Visa Inc  HCL Technologies  Tata Consultancy (TCS)  Accenture  Accenture India      basic        frequent


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.
  Q4. What is rule regarding overriding equals and hashCode method ?Core Java
Admin
info@buggybread.com
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

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 Q5. Explain OAuth.Authentication2018-07-16 09:41:42

Ans. OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. Like using Google or Facebook to login to something.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like      Discuss      Correct / Improve          BNY Mellon  BlackBerry  N26  Kore  HCL Technologies  Auth0  Ping Identity  Visa inc  Get My Parking  Talview  eTouch Systems  SysDig  LogMeIn  Opera Solutions  TransPerfect  N26  Securance




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