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Interview Questions and Answers for 'Qualcomm' - 3 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

Try 6 Question(s) Test


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?


Frequently asked question for intermediate developers.
  Q2. What is Volatile keyword used for ?Core Java
Anonymous
Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached.

  Sample Code for volatile

 Help us improve. Please let us know the company, where you were asked this question :   

   Like         Discuss         Correct / Improve     java   oops   synchronization   volatile   java keywords     Asked in 42 Companies      intermediate        frequent

Try 1 Question(s) Test


Related Questions

  How does volatile affect code optimization by compiler?
 how is the internal code for the "volatile" implemented ?
 What are the different ways to avoid multi Threading related problems in Java ?
 Can we make array volatile in Java ?
 Have you heard of volatile Table in Teradata ?
 what is volatile and atomic


 Q3. What is Priority inversion ?Operating System2017-03-08 12:19:40

Ans. Priority inversion is a problematic scenario in scheduling in which a high priority task is indirectly preempted by a lower priority task effectively inverting the relative priorities of the two tasks.

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   Like         Discuss         Correct / Improve          Asked in 5 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?
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  What is the difference between Encapsulation and Abstraction?




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