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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     Asked in 1 Companies


  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     Asked in 16 Companies      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     Asked in 6 Companies      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     Asked in 44 Companies      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.

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   Like         Discuss         Correct / Improve          Asked in 17 Companies




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