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| Interview Questions and Answers for 'Catalystone' - 2 question(s) found - Order By Newest | |||||
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| 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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 Discuss Correct / Improve  oops oops features  Asked in 237 Companies  basic  frequent | |||||
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 Can you give a real world example of Encapsulation and Abstraction ? | |||||
| Which of the following Java feature promotes access protection or Hiding ? a. Inheritance b. Encapsulation c. Abstraction d. Composition | |||||
| Define encapsulation in Java ? | |||||
| Give an example of how Object Oriented Programming Concepts can be implemented. | |||||
| Which of the OOP's features facilitate dependency injection ? | |||||
| Which of the OOP's feature - encapsulation or abstraction - is more important ? | |||||
| Which of the polymorphism type - static or runtime - is more important ? | |||||
| Which of the OOP's feature is most important ? | |||||
 Frequently asked in all types of companies especially Indian Services companies. Frequently asked in CTS (Based on 2 feedback) | |||||
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| Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not. | |||||
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| Discuss Correct / Improve java collections hashcode advanced hashtable Asked in 32 Companies intermediate frequent | |||||
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| Related Questions | |||||
| Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? | |||||
| Write a class and override the equals and hashcode method ? | |||||
| How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero. | |||||
| What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ? | |||||
