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Expert Websoft Java Coaching Institute

Mayuri apts,Prashant Society,lane no. 3, plot no.21, behind Krishna Hospital, Paud Rd, Kothrud, Pune, Maharashtra 411038, India

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Interview Questions and Answers for 'Expert' - 81 question(s) found - Order By Rating

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 Q1. What is the O notation for the ArrayList and List? And which one would you choose to insert item in the middle?Data Structure2019-10-29 15:21:28

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 Q2. How does Garbage Collector work? What are the realizations of Garbage Collector.Core Java2019-10-28 15:24:28

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 Q3. What is something faulty about java ?Core Java2019-04-05 13:29:33

Ans. Not purely object oriented Language.

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 Q4. What will happen if there are no interfaces in Java ?Core Java2018-12-11 16:16:37

Ans. Abstract classes can take care of that to a certain extent. Though they are little heavier than Interfaces but An abstract class with all abstract methods and no instance variables will be able to help with everything that currently an interface does.

The only problem is that a class can only extend one class whereas it can implements multiple interfaces and that is the reason Interfaces were introduced in Java, i.e to get over the problem of multiple inheritance.

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 Q5. Why Concurrent Collection Classes are fail-fast in Java ?Core Java2018-07-20 18:02:59

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   Like         Discuss         Correct / Improve     concurrent collection classes   fail fast   fail-fast  collections  collection classes      expert


 Q6. How is the virtual method table implemented in Java?Core Java2018-07-16 07:55:56

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   Like         Discuss         Correct / Improve     virtual method table   method overriding  runtime polymorphism  object oriented programming (oops)  oops concepts      expert        rare


 Q7. Are final methods faster than regular instance methods ?Core Java2018-07-16 06:53:39

Ans. Yes. As they cannot be overridden , there is no use of virtual table concept which is used for dynamic binding resolution.

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 Q8. What could be the reasons for restricting inheritance using final class ?Core Java2018-07-16 06:52:00

Ans. 1. Enforcing composition over inheritance
2. Restricting overriding of certain methods
3. Final methods are faster than regular instance methods
4. Enforcing Immutability

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 Q9. Does use of Final class enforces composition over Inheritance in Java ? Core Java2018-07-16 06:49:53

Ans. Yes, to a certain extent. But the objective for Final class could be beyond just enforcing composition as certain classes might have been created without inheritance or composition in mind.

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 Q10. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?Algorithm2018-06-30 13:42:38

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 Q11. How would you design a Thread Pool ?Design2018-06-21 18:06:31

Ans. By using Executor Framework , we can create Thread pool

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 Q12. Design database schema for Facebook like application.Database2018-06-21 18:01:57

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 Q13. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome. Design2018-05-24 13:26:34

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 Q14. What are the ways to break singleton pattern ?Design2018-04-08 11:16:57

Ans. If we don't have double checked locking, it can be broken easily through multi threaded access.

Through Reflection.

If multiple class loaders are loading the class.

If the class is serializable or cloneable.


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   Like         Discuss         Correct / Improve     singleton     Asked in 2 Companies      expert


 Q15. Why do we need to specify import statement ? Don't you think Java could have been designed in such a way to automatically import everything that's in the class path ?Core Java2018-02-04 18:50:16

Ans. Java could design it in such a manner but would result in ambiguity if there are multiple files with the same name. The only way to get over it to show the message when you use any such class to provide explicit import with the package prefix. The other problem could be that Java might have to change the early import to Late import and check what's being used to decide what needs to be imported as otherwise you will see errors regarding the ambiguous imports with duplicate file name.

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 Q16. How ConcurrentHashMap provides better performance compared to HashTable ?Core Java2017-09-03 11:44:29

Ans. ConcurrentHashMap uses multiple buckets to store Data and hence avoid read locks which facilitates better performance.

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 Q17. Why can we have a static inner class but not a static Top level class in Java ?Core Java2017-08-23 20:14:59

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 Q18. What are the advantage of Abstract classes over interfaces with respect to Java 7 ? and What changed in Java 8 to help facilitate that in Java 8 ?Core Java2017-08-17 19:28:33

Ans. Abstract Classes provide default implementations of methods that are inherited by the classes that extend them, which was not the case for Interfaces. This changed in Java 8, where default implementations are provided for methods.

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   Like         Discuss         Correct / Improve     abstract classes  interfaces  default method     Asked in 1 Companies      expert


 Q19. In Java, would you like to see an explicit destructor?Core Java2017-06-23 13:17:35

Ans. Yes , a gc method to explicitly call garbage collection immediately on the object. It will provide better flexibility over application that require optimal usage of memory.

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 Q20. How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?Core Java2017-06-22 11:32:57

Ans. String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment or hacker over internet.

Once a String constant is created in Java , it stays in string constant pool until garbage collected and hence stays there much longer than what's needed. Any unauthorized access to string Pool pose a threat of exposing these values.


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  Q21. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java2017-06-13 08:25:45

Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protection
4. Polymorphism for flexibility and interfacing

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 Q22. Why Java doesn't provide a default constructor if we define an argument constructor ?Core Java2017-03-10 09:58:43

Ans. Java provides a default constructor ( no argument ) if no constructor is provided by the programmer. Java makes a check during pre compilation if there is any constructor provided by the programmer. If any constructor is provided, Java understands that programmer has provided all the mechanism for initialization and construction of the object and may not even intend to create objects by calling a no argument constructor. For example - One may like to have objects created with self defined state otherwise restrict its creation.

We make the constructor private if we want to make a class singleton as we would like to restrict creation of new objects using new operator and default constructor. Similar could be the situation wherein we would like to construct objects in a particular manner only.

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 Q23. How Marker interfaces works internally ?Core Java2017-02-23 10:38:31

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 Q24. Which memory segment holds String Pool in Java ?Core Java2017-01-14 20:57:22

Ans. String Pool resides in runtime constant Pool which is a part of Heap memory segment.

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 Q25. Can we declare static variables as transient ?Core Java2017-01-12 11:12:48

Ans. It's weird that compiler doesn't complain if we declare transient with static variable because it makes no sense. At least a warning message saying "transient is useless in this situation" would have helped with code cleaning.

Static variables are never serialized and transient is an indication that the specified variable shouldn't be serialized so its kind of double enforcement not to serialize.

It could be that as it makes no different to the variable behavior and hence using both keywords with a variable are permitted.

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 Q26. Can constructor be synchronized in Java ?Core Java2017-01-10 10:43:19

Ans. No, constructors can not be synchronized in Java. In fact using the keyword synchronized with a constructor results in compilation error.

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 Q27. How is hashcode calculated in java ?

or

What are the rules for hashcode calculation ?
Core Java2017-01-09 13:27:25

Ans. General contract of hashCode is:

1.Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer,

2.If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.

3.It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results.

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 Q28. What is serialVersionUID ?Core Java2016-12-20 17:26:52

Ans. Everytime an object is serialized the java serialization mechanism automatically computes a hash value by passing the meta information for the class. This id is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization

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 Q29. Design a Data Structure for a full text Search ?Design2016-12-13 14:47:02

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Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q30. How is Hashmap internally implemented in Java ?Core Java2016-12-06 08:49:37

Ans. https://www.quora.com/How-is-Hashmap-in-Java-implemented-internally-What-are-the-pros-and-cons-to-use-it-What-are-the-complexities-it-provides-for-insert-delete-and-lookup/answer/Anshudeep-Bajpai?srid=iwnK

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   Like         Discuss         Correct / Improve     hashmap  collections  hashmap internal implementation     Asked in 19 Companies      expert        frequent


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