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Core java - Interview Questions and Answers for 'Ancestry' - 8 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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Try 3 Question(s) Test


Frequently asked at HCL Technologies ( Based on 3 feedback )
  Q2. Difference between Checked and Unchecked exceptions ?Core Java
Anonymous
Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked.

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Try 1 Question(s) Test


Frequently asked in face to face interviews.
  Q3. Write a program to print fibonacci series.Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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 Q4. Why shouldn't we use string concatenation extensively or in a loop ?Core Java2017-08-08 09:52:53

Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable.

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   Like      Discuss      Correct / Improve     string  string immutable     Ancestry


 Q5. Which immutable classes have you worked with ? Can you name some immutable Collections ? How to make an immutable collection ?Core Java2017-08-28 17:11:22

Ans. string and wrapper class objects

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   Like      Discuss      Correct / Improve     immutability  immutable classes   immutable collections     Ancestry  HCL Technologies  Tata Consultancy (TCS)


 Q6. What are the benefits of immutability or Immutable classes ?Core Java2017-08-28 19:36:18

Ans. Immutable objects are thread-safe so you will not have any synchronization issues.Immutable objects are good for Map keys and Set elements, since these typically do not change once created.Immutability makes it easier to write, use and reason about the code (class invariant is established once and then unchanged)Immutability makes it easier to parallelize your program as there are no conflicts among objects.The internal state of your program will be consistent even if you have exceptions.References to immutable objects can be cached as they are not going to change.

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   Like      Discuss      Correct / Improve     immutable classes   benefits of immutable classes     Ancestry


 Q7. How is LinkedList collection class internally implemented ? Is it a Linked List or Doubly Linked List ? Core Java2017-08-28 19:40:39

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


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   Like      Discuss      Correct / Improve     linkedlist  internal implementation of linkedlist     Ancestry


  Q8. What is collection framework in Java ?Core Java2017-12-27 19:17:14

Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them.

  Sample Code for Map

  Sample Code for HashMap

  Sample Code for Treemap

  Sample Code for set

  Sample Code for hashset

  Sample Code for treeset

  Sample Code for list

  Sample Code for arraylist

  Sample Code for linkedlist

  Sample Code for queue

  Sample Code for priorityqueue

  Sample Code for concurrenthashmap

  Sample Code for vector

  Sample Code for stack

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Ancestry: This company indeed has very good work ... Anonymous

Ancestry: Coding assignment comprising of 3 questions, 1 object oriented ... Anonymous

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