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

Basic and Very Frequently asked.
  Q1. What is Polymorphism in Java ?Core Java2016-11-06 09:10:54

Ans. Polymorphism means the condition of occurring in several different forms.

Polymorphism in Java is achieved in two manners

1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas

2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

  Sample Code for overloading

  Sample Code for overriding

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Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)
  Q2. What is the use of hashcode in Java ?Core Java
Anonymous
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not.

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   Like      Discuss      Correct / Improve     java   collections   hashcode   advanced  hashtable     Cognizant (CTS)  Compro Technologies  VigLink  Proofpoint  Accolite  Foot Locker  IMC Trading  LG Mobile Phones  Probity Soft  EPPS Infotech  AbeBooks  LiquidNet  Google  Girmiti Software  Hashcode IT Solutions  Aurionpro Solutions  Insonix  Genpact  Trentor  CatalystOne Solutions  RedBlink  Bayatree Infocom  Security Weaver  Steg Technologies  Roshi Software Solutions  DreamSoft4u  Decipher Zone Softwares  Precise Automation & Robotics  Componence  Dainik Navajyoti  Bodacious IT Hub  Naggaro      intermediate        frequent

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  Q3. Write a method to check if input String is Palindrome?Core Java
Admin
info@buggybread.com
Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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 Q4. What is the difference between JPA and Hibernate ?Hibernate
Admin
info@buggybread.com
Ans. JPA or Java Persistence API is a standard specification for ORM implementations whereas Hibernate is the actual ORM implementation or framework.

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   Like      Discuss      Correct / Improve     jpa   hibernate   orm   architecture   technologies     Wizni  Naggaro




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