Core java - Interview Questions and Answers for 'Markit' - 3 question(s) found - Order By Newest Basic and Very Frequently asked. Ans. Polymorphism means the condition of occurring in several different forms. Sample Code for overloading Sample Code for overriding Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 108 Companies Basic frequent Related Questions What are points to consider in terms of access modifier when we are overriding any method? If everything is an object , Cant we declare every object as Why do we need polymorphism in Java ? How does java identifies which method to be called in method overriding or runtime polymorphism, when both methods share the same name and signature ? Shouldn't we make a class with all static members is its just expected to be executed as a standalone program with just one thread. Moreover Lets assume that there is no runtime Polymorphism required and there is no need for serialization ? Is this Polymorphism ? When are static and instance methods resolved ? During compile time or Runtime ? Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ? Which of the following do you think is the primary reason you would never use a static class even the application doesn't need multiple requests or threads ? Frequently asked in Infosys India 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. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 31 Companies intermediate frequent 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 What will be result of following code and why 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 ? Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 32 Companies rare Related Questions What is ConcurrentModificationException ? What is a BlockingQueue? What is concurrent interface ? What is ConcurrentLinkedDeque ? What is CopyOnWriteArrayList ? What are the advantages and disadvantages of CopyOnWriteArrayList ? Name few Concurrent Collection Classes ? Difference between concurrentHashMap and HashTable ? isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?
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