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| Core java - Interview Questions and Answers for 'Axtria' - 3 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 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 ? | ||||
 Frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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| Ans. clone() - Creates and returns a copy of this object. equals() - Indicates whether some other object is "equal to" this one. finalize() - Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. getClass() - Returns the runtime class of an object. hashCode() - Returns a hash code value for the object. toString() - Returns a string representation of the object. notify(), notifyAll(), and wait() - Play a part in synchronizing the activities of independently running threads in a program. | ||||
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| Discuss Correct / Improve java oops object class Asked in 16 Companies basic frequent | ||||
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| Difference between == and .equals() ? | ||||
| Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? | ||||
| What is the use of Object class ? | ||||
| Can we override wait() or notify() methods? | ||||
| How you can check Object is created or not in case of Singleton using Object class method ? | ||||
| Why wait(), notify(), notifyAll() methods are in Object class instead of Thread class? | ||||
| Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM. | ||||
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| Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached. | ||||
 Sample Code for volatile | ||||
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| Discuss Correct / Improve java oops synchronization volatile java keywords Asked in 42 Companies intermediate frequent | ||||
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| Related Questions | ||||
| How does volatile affect code optimization by compiler? | ||||
| how is the internal code for the "volatile" implemented ? | ||||
| What are the different ways to avoid multi Threading related problems in Java ? | ||||
| Can we make array volatile in Java ? | ||||
| Have you heard of volatile Table in Teradata ? | ||||
| what is volatile and atomic | ||||
