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Core java - Interview Questions and Answers for 'Genpact' - 6 question(s) found - Order By Newest

Frequently asked in Infosys and HCL Technologies ( Based on 2 feedback )
 Q1. What are different ways of object creation in Java ?Core Java
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info@buggybread.com
Ans. Using new operator - new xyzClass()

Using factory methods - xyzFactory.getInstance( )

Using newInstance( ) method - (Class.forName(xyzClass))emp.newInstance( )

By cloning an already available object - (xyzClass)obj1.clone( )

  Sample Code for object initialization using clone

  Sample Code for object initialization using getInstance

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   Like      Discuss      Correct / Improve     java   oops   object creation   new operator   class.forname   cloning   ebay     Intelligrape  Infosys  Polaris  British Telecom (BT)  Vyom Labs  Deutsche Bank  HCL Technologies   Genpact  Thomson Reuters      expert


 Q2. What are points to consider in terms of access modifier when we are overriding any method?Core Java
Admin
info@buggybread.com
Ans. 1. Overriding method can not be more restrictive than the overridden method.

reason : in case of polymorphism , at object creation jvm look for actual runtime object. jvm does not look for reference type and while calling methods it look for overridden method.

If by means subclass were allowed to change the access modifier on the overriding method, then suddenly at runtime when the JVM invokes the true objects version of the method rather than the reference types version then it will be problematic

2. In case of subclass and superclass define in different package, we can override only those method which have public or protected access.

3. We can not override any private method because private methods can not be inherited and if method can not be inherited then method can not be overridden.

  Sample Code for Overriding

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   Like      Discuss      Correct / Improve     java   overriding   access specifier   inheritence   oops   polymorphism  object oriented programming (oops)  oops concepts   runtime polymorphism  object oriented programming (oops)  oops concepts     Genpact

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Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback)
  Q3. 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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Very frequently asked in HCL Tech ( Based of 4 inputs )
  Q4. Write a program to reverse a string iteratively and recursively ?Core Java
Admin
info@buggybread.com
Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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   Like      Discuss      Correct / Improve     java   string   reverse   stringbuffer   string class   code     HCL Technologies  Exelis  Mahindra Comviva  Fidelity National Information Services (FIS)   Genpact  Digite Infotech        frequent


 Q5. What is recursion in Java ?Core Java2017-04-18 20:12:05

Ans. It's a programming technique wherein the method can call itself. The method call usually involves a different set of parameters as otherwise it would lead to an infinite loop. There is usually a termination check and statement to finally return the control out of all function calls.

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   Like      Discuss      Correct / Improve          Genpact      Basic


 Q6. What is object cloning ?Core Java2017-12-26 09:47:42

 This question was recently asked at 'Genpact'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     cloning     Genpact      basic        frequent




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