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Interview Questions and Answers for 'QualiTest' - 4 question(s) found - Order By Newest

Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ) and Coginizant (CTS)
  Q1. Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?
Core Java
Anonymous
Ans. If the Object value will not change, use String Class because a String object is immutable.

If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster).

If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized).

  Sample Code for String

  Sample Code for StringBuffer

  Sample Code for StringBuilder

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   Like      Discuss      Correct / Improve     java   string class   string   stringbuilder   stringbuffer     Cognizant (CTS)   San Jose State University (SJSU)  HCL Technologies   Deloitte  Sophos  Hitachi  JPMorgan Chase  IBM  Kony Labs  Keystone  ebay  TIAA Financial Services  Ancestry   Rakuten  Accenture  Accenture India  QualiTest Group  CDK Global  InfoGain  Mindfire Solutions  Shopify  Tk20  AppKnox  RedMane Technology  Fidelity  travelex      basic        frequent

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 Q2. What are the benefits of JSON over XML ?Json
Anonymous
Ans. Lighter and faster than XML as on-the-wire data format

Object Representation - Information is presented in object notations and hence better understandable.

Easy to parse and conversion to objects for information consumption.

Support multiple data types - JSON supports string, number, array, boolean whereas XML data are all string.

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   Like      Discuss      Correct / Improve     json   markup language     QualiTest      intermediate        frequent

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Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc.
  Q3. What is the difference between StringBuffer and String class ?Core Java
Anonymous
Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.

The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created.

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   Like      Discuss      Correct / Improve     java   string   stringbuffer   frequently asked     BlackRock  Synechron  RedMane Technology  Velopsys Technologies   American Express  Sophos  QualiTest  ebay  Infosys Technologies  American Express      basic        frequent

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Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations.
  Q4. Difference between StringBuffer and StringBuilder ?Core Java
Anonymous
Ans. StringBuffer is synchronized whereas StringBuilder is not.

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   Like      Discuss      Correct / Improve     java   string   stringbuffer   string class   stringbuilder   synchronized   basic interview question   infosys technologies     Thomson Reuters  Ludia  QualiTest  United Health Group (UHG)  Sophos  JPMorgan Chase  ebay  Infosys Technologies  Experian India  HCL Technologies  Symantec  Tata Consultancy (TCS)  Accenture  Accenture India  Infosys  Cerner  Priceline      basic        frequent

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