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| Core Java - Interview Questions and Answers for 'Oops features' - 9 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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| Ans. Car Engine is an example of encapsulation and abstraction. You ignite the car using an interface called starter and least bothered about how the tire actually moves (This is abstraction). The engine encapsulates the complete process to itself only and doesn't allow you to start the other components like the radiator etc ( this is excapsulation ) | ||||
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| Discuss Correct / Improve encapsulation object oriented programming (oops) oops concepts abstraction oops oops features java features Asked in 13 Companies | ||||
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| Ans. Encapsulation | ||||
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| Discuss Correct / Improve java java concepts java features oops concepts oops features access protection information hiding | ||||
 Very frequently asked. Usually among very first few questions. | ||||
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| Ans. Encapsulation is a feature of OOP's that binds the data and it's associated methods together as a single unit and facilitate protection and data hiding by providing minimal interface to outside. For example - member variables are declared private and are accessed through public methods. Moreover we have private methods that can only be used internally and hence providing minimal interface to outside class through use of public methods. | ||||
 Sample Code for encapsulation | ||||
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| Discuss Correct / Improve encapsulation object oriented programming (oops) oops concepts oops oops concepts oops features Asked in 4 Companies Basic frequent | ||||
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| Ans. You can implement encapsulation in Java by keeping the fields (class variables) private and providing public getter and setter methods to each of them. Java Beans are examples of fully encapsulated classes. Encapsulation in Java: Restricts direct access to data members (fields) of a class. | ||||
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| Discuss Correct / Improve oops oops example oops concepts oops features Asked in 2 Companies basic frequent | ||||
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| Ans. Inheritance , Runtime Polymorphism and Composition. | ||||
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| Discuss Correct / Improve dependency injection inversion of control ioc oops oops features | ||||
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| Ans. Encapsulation facilitates security by hiding data and logic whereas Abstraction simplifies organization of data and related logic. As applications scale, both concepts are required for easy management and maintenance. Encapsulation for security and criss cross communication between objects / modules will make it vulnerable. and Abstraction for better organization that enables better understanding of application code and easy maintainability. | ||||
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| Discuss Correct / Improve oops oops features oops concepts | ||||
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| Ans. Method overloading / static polymorphism compared to method overriding / runtime polymorphism has very limited usage as it just opens up an alternate way of defining a different method with the same name. Method Overriding on other hand opens up many other features like contracting , interfacing , pluging development and hence development of libraries and frameworks. | ||||
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| Discuss Correct / Improve oops oops features oops concepts | ||||
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| Ans. Encapsulation facilitate hiding and restricted access and hence more of a security feature. Encapsulation is definitely a great feature as when applications expand criss cross communication between objects / modules could lead to blunders. Inheritance facilitates code reuse. Polymorphism comprise of method overloaded ( which to me is negligible usage ) and method overriding. Method overriding is of great usage as it facilitates concept of interfaces and plugin development. So it’s Security / Organization vs Code Reuse / Support for other features like overriding vs Contracts / Plugin Development facilitating the creation of frameworks / libraries. Which is more important may vary from application to application , its scale , its use , its sensitivity etc. | ||||
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| Discuss Correct / Improve oops oops features oops concepts | ||||
