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| Interview Questions and Answers for 'Crossover' - 3 question(s) found - Order By Rating | ||||
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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 260 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 ? | ||||
 Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions. | ||||
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| Ans. A Class must override the hashCode method if its overriding the equals method. | ||||
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| Discuss Correct / Improve java collections hashcode hash code equals collections Asked in 44 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. | ||||
| Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews. | ||||
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| Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ). A class can extend single abstract class whereas it can implement multiple interfaces. | ||||
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| Discuss Correct / Improve java classes abstract class interfaces abstract class vs interface abstract classes vs interfaces Asked in 82 Companies basic frequent | ||||
| Related Questions | ||||
| What are the different uses of Interfaces in Java ? | ||||
| Why can't we have diamond problem with interfaces ? | ||||
| Why do we need Thread class even in case we execute thread using runnable interface ? | ||||
| What is the difference between List, Set and Map ? or What are the different Java Collections Interfaces ? | ||||
| What are Marker Interfaces ? Name few Java marker interfaces ? | ||||
| Can we declare interface methods as private ? | ||||
| What is comparator interface used for ? | ||||
| What is the use of runnable interface if we can always create a new thread using Thread class ? | ||||
| Which of the following doesn't extend Collection interface ? | ||||
