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Core java - Interview Questions and Answers for 'Bureau veritas' - 3 question(s) found - Order By Newest

Frequently asked in Infosys India
  Q1. What is a String Pool ?Core Java
Ans. String pool (String intern pool) is a special storage area in Java heap. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference.

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   Like         Discuss         Correct / Improve     java   oops   string   string class   string pool   heap memory     Asked in 31 Companies      intermediate        frequent
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Related Questions
  Why Char array is preferred over String for storing password?
  What are different ways to create String Object? Explain.
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
 Which memory segment holds String Pool in Java ?
 How and Why Strings are interned in Java ?
 What will be the output of following code

Integer x = 1;
Integer y = 2;
System.out.println(x == y);

What if you change 1 to "1" and Integer to String?
 What will be result of following code and why

Integer int1 = 1;
Integer int2 = 1;
String str1 = new String("str");
String str2 = new String("str");
String str3 = "str";
String str4 = "str";

      
System.out.println(int1 == int2);
System.out.println(str1 == str2);
System.out.println(str3 == str4);
 What is the purpose of String Pool ? Don't you think it's a performance overhead to have unnecessary check for string in string pool ?
 Why string pool concept has been introduced in string ?

Very frequently asked. Usually asked with questions related to String. Frequently asked at CTS / Cognizant
  Q2. What is an Immutable Object ?Core Java
Ans. Object that can't be changed after instantiation.

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   Like         Discuss         Correct / Improve     java   oops   immutable  immutability     Asked in 27 Companies      basic        frequent
Try 2 Question(s) Test

Related Questions
  Why is String immutable in Java ?
  Why Char array is preferred over String for storing password?
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
 How is string object immutable if we can concat a string to it ?
  How to implement an immutable class ?
  What is an immutable class ?
  Does Declaring an object "final" makes it immutable ?
 Is String final in Java ?
  What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?

 Q3. How is Abstraction implemented in Java ?Core Java
Ans. Abstraction is provided in Java by following ways -

Coding to the ( Interfaces / Abstract Classes ) or contracts

By Encapsulating details within classes and exposing the minimal Door ( few public methods )

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   Like         Discuss         Correct / Improve     java   oops concepts   abstraction   interfaces   abstract class   encapsulation  object oriented programming (oops)  oops concepts     Asked in 3 Companies      basic        frequent

Related Questions
  What is the difference between Encapsulation and Abstraction?
 Can you give a real world example of Encapsulation and Abstraction ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
 What is abstraction ?
  Difference between Abstraction and Implementation hiding ?
  What are the examples of Abstraction in Java ?
 What are the uses of Abstraction ?
 how does abstraction help your application ?
 What is abstraction ?

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