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Interview Questions and Answers for 'Abhra' - 2 question(s) found - Order By Newest

Basic and Very Frequently asked.

Q1. What is Polymorphism in Java ?

Ans. Polymorphism means the condition of occurring in several different forms.

Polymorphism in Java is achieved in two manners

1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas

2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding.

Sample Code for overloading

Sample Code for overriding

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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

Object obj = new String();

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 ?

Map<String, List<String>> inventoryManagerCountMap = new HashMap<String, ArrayList<String>>();

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 ?

a. Serialization
b. Runtime Polymorphism
c. Lazy Loading
d. Memory

Q2. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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Difference between == and .equals() ?

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