Interview Questions and Answers for 'Java r' | Search Interview Question

Interview Questions and Answers for 'Java r' - 4 question(s) found - Order By Rating

Q1. Explain OOPs

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Explain OOPs Principles

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Explain OOPs Concepts

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Explain OOPs features

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Tell me something about OOPs

Core Java

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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Q2. Which are the reserved words in Java ?

Core Java

Ans. All Keywords , modifiers ( public , static , final etc ) as well as non modifier keywords ( for, if,switch etc ) are reserved words in java and hence cannot be used as identifiers. Along with keywords , there are few literals that have predefined meaning and hence cannot be used as identifiers, these are true , false and null.

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Q3. What is ConcurrentModificationException ?

Core Java

Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it.

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Q4. What is the use of Runtime Class ?

Ans. This class is used to provide access to the Java runtime system

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