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Core java - Interview Questions and Answers for 'Fiserv' - 3 question(s) found - Order By Newest

Q1. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

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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Related Questions

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 ?

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Q2. Difference between TreeMap and HashMap ?

Core Java

Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly.

Sample Code for treemap

Sample Code for hashmap

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Related Questions

What is comparator interface used for ?

Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap

Which are the sorted collections ?

Which of the following collection maintain its elements in Natural Sorted order ?

How can we reverse the order in the TreeMap ?

TreeMap orders the elements on which field ?

How TreeMap orders the elements if the Key is a String ?

Can we add heterogeneous elements into TreeMap ?

Will it create any problem if We add elements with key as user defined object into the TreeMap ?

Q3. Write a Program to validate an email address

Core Java

Ans. public class Class{
public static void main(String[] args){
String str = "xyz@123.com";

if(!str.contains("@") && !str.contains(".") && (str.indexOf('.') < str.indexOf('@'))){
System.out.println("Not a Valid Email Address");
}
}
}

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Related Questions

What are the steps to be performed while coding Junit with Mocking framework ?

What is a Sequence File?

What different level of logging you use while coding ?

Have you ever encoded the response before sending it back from the service? If Yes , Which encoding was used ?

What are the different type of encoding you have used ?

How does encoding affect using Reader / writer classes or Stream classes in Java ?

What is the difference between html encoding and url encoding ?

Does spaces get's encoded in html encoding ?

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