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Core java - Interview Questions and Answers for 'Fdm group' - 2 question(s) found
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Basic and Very Frequently asked.
Q1.
What is Polymorphism in Java ?
Core 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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 polymorphism  object oriented programming (oops)  oops concepts  oops concepts
Asked in 108 Companies
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Static Polymorphic in Java is achieved through ..
Method Overloading
Method Overriding
Variable Overloading
Variable Overriding
Runtime Polymorphism in Java is achieved through ..
Method Overloading
Method Overriding
Variable Overloading
Variable Overriding
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
Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
Q2.
Difference between Overloading and Overriding ?
Core Java
Ans. Overloading - Similar Signature but different definition , like function overloading.
Overriding - Overriding the Definition of base class in the derived class.
Sample Code for overloading
Sample Code for overriding
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 java   oops   overloading   overriding   oops concepts   basic interview question   overloading vs overriding
Asked in 86 Companies
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Which of the following can be overridden ?
final instance methods
final static methods
non final instance methods
non final static methods
Related Questions
What are the difference between composition and inheritance in Java?
Explain OOPs
or
Explain OOPs Principles
or
Explain OOPs Concepts
or
Explain OOPs features
or
Tell me something about OOPs
What is the difference between Encapsulation and Abstraction?
What are points to consider in terms of access modifier when we are overriding any method?
What is Polymorphism in Java ?
Can you give a real world example of Encapsulation and Abstraction ?
Why every object constructor automatically call super() in Object before its own constructors?
How compiler handles the exceptions in overriding ?
Difference between Composition and Inheritance ?
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