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Design - Interview Questions and Answers for 'Atos' - 5 question(s) found - Order By Newest

Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback )
  Q1. Difference between == and .equals() ?Core Java
Anonymous
Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

  Sample Code for equals

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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     Asked in 289 Companies      basic        frequent

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Related Questions

 What is the difference between = and == in Java ?
 How is == operator different for objects and primitive types ?
 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?


Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews.
  Q2. Differences between abstract class and interface ?Core Java
Admin
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Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

A class can extend single abstract class whereas it can implement multiple interfaces.

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   Like         Discuss         Correct / Improve     java   classes   abstract class   interfaces     Asked in 65 Companies      basic        frequent


Related Questions

 What are the different uses of Interfaces in Java ?
 Why can't we have diamond problem with interfaces ?
  What is the difference between List, Set and Map ?

or

What are the different Java Collections Interfaces ?
  What are Marker Interfaces ? Name few Java marker interfaces ?
  Why do we need Thread class even in case we execute thread using runnable interface ?
  Which of the following doesn't extend Collection interface ?
 If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?
  What is an API ( Application Programming Interface ) ?
  Can we declare interface methods as private ?


 Q3. Design ATM machine application using oops.Design2018-03-28 10:42:04

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


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


Related Questions

  Difference between == and .equals() ?
  Why is String immutable in Java ?
  Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?
  What are the difference between composition and inheritance in Java?
  What are different ways to create String Object? Explain.
  Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?
  Does garbage collection guarantee that a program will not run out of memory?
  Why Char array is preferred over String for storing password?
  What do you mean by "Java is a statically typed language" ?
  What is the difference between Encapsulation and Abstraction?


 Q4. Which of the following is true for == operator ?Core Java
a. For primitives, == checks if the variables on left and right have same data type
b. For primitives, == checks if the variables on left and right have same value
c. For Objects, == checks if the references on left and right have same data type
d. For Objects, == checks if the references on left and right have same value

Ans.b. For primitives, == checks if the variables on left and right have same value

 Q5. Which of the following is equivalent to following logic ?

Not X && Not Y
Core Java
a. x || Y
b. Not(X || Y)
c. Not(X && Y)
d. Not X && Y

Ans.b. Not(X || Y)



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