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| Core java - Interview Questions and Answers for '3i infotech' - 7 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 | ||||
 Frequently asked at Manhattan Associates ( Based on 2 feedback ) | ||||
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| Ans. Its an anonymous method without any declaration. Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code. It promotes Developer productivity, Better Readable and Reliable code. | ||||
 Sample Code for lambda | ||||
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| Discuss Correct / Improve java java8 lambda expression architecture Asked in 58 Companies expert frequent | ||||
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| Basic and Very Frequently asked. | ||||
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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 108 Companies Basic frequent | ||||
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| Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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| Ans. Its a method which cannot be overridden. Compiler throws an error if we try to override a method which has been declared final in the parent class. | ||||
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| Discuss Correct / Improve java oops final final method Asked in 30 Companies basic frequent | ||||
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| Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc. | ||||
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| Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created. | ||||
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| Discuss Correct / Improve java string stringbuffer frequently asked Asked in 18 Companies basic frequent | ||||
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| Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example: static { // whatever code is needed for initialization goes here } A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code. | ||||
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| Discuss Correct / Improve java oops static static block Asked in 16 Companies basic frequent | ||||
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| Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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| Discuss Correct / Improve core oops concepts Asked in 65 Companies basic frequent | ||||
Which Java version introduced Lambda expressions ?
