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| Core java - Interview Questions and Answers for 'Erricson' - 4 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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| 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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| Discuss Correct / Improve polymorphism object oriented programming (oops) oops concepts oops concepts Asked in 107 Companies Basic frequent | |||||
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| Very frequently asked in phone and walk in interviews. | |||||
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| Ans. An interface without any method declaration is called as marker interface. there are 3 in-built interfaces in JVM i.e. serializable, clonable, remote | |||||
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| Discuss Correct / Improve java oops interfaces marker interface serializable clonable Asked in 21 Companies intermediate frequent | |||||
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| Ans. Transient variables are variable that cannot be serialized. | |||||
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| Discuss Correct / Improve java serialization transient Asked in 15 Companies intermediate rare | |||||
Static Polymorphic in Java is achieved through .. 
