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Core java - Interview Questions and Answers for 'Mastercard' - 5 question(s) found - Order By Newest

Very frequently asked. Favorite question in Walk in Drive of many Indian service companies.
  Q1. What is a Final Variable ?Core Java
Anonymous
Ans. Final variable is a variable constant that cannot be changed after initialization.

  Sample Code for final variable

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 Q2. How to implement an immutable class ?Core Java
Anonymous
Ans. We can make a class immutable by

1. Making all methods and variables as private.

2. Setting variables within constructor.

Public Class ImmutableClass{

private int member;
ImmutableClass(int var){
member=var;
}
}

and then we can initialize the object of the class as

ImmutableClass immutableObject = new ImmutableClass(5);

Now all members being private , you cant change the state of the object.

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 Q3. How to find the median number in an array of integers ?Core Java2017-02-02 18:04:41

Ans.

Arrays.sort(numArray);
double median;
if (numArray.length % 2 == 0)
   median = ((double)numArray[numArray.length/2] (double)numArray[numArray.length/2 - 1])/2;
else
   median = (double) numArray[numArray.length-1/2];

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  Q4. Explain OOps concepts.Core Java2017-12-25 17:29:13

Ans. There are four main OOP concepts in Java. These are:

Abstraction. Abstraction means using simple things to represent complexity. We all know how to turn the TV on, but we don?t need to know how it works in order to enjoy it. In Java, abstraction means simple things like objects, classes, and variables represent more complex underlying code and data. This is important because it lets avoid repeating the same work multiple times.

Encapsulation. This is the practice of keeping fields within a class private, then providing access to them via public methods. It?s a protective barrier that keeps the data and code safe within the class itself. This way, we can re-use objects like code components or variables without allowing open access to the data system-wide.

Inheritance. This is a special feature of Object Oriented Programming in Java. It lets programmers create new classes that share some of the attributes of existing classes. This lets us build on previous work without reinventing the wheel.

Polymorphism. This Java OOP concept lets programmers use the same word to mean different things in different contexts. One form of polymorphism in Java is method overloading. That?s when different meanings are implied by the code itself. The other form is method overriding. That?s when the different meanings are implied by the values of the supplied variables. See more on this below.

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  Q5. What is collection framework in Java ?Core Java2017-12-27 19:17:14

Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them.

  Sample Code for Map

  Sample Code for HashMap

  Sample Code for Treemap

  Sample Code for set

  Sample Code for hashset

  Sample Code for treeset

  Sample Code for list

  Sample Code for arraylist

  Sample Code for linkedlist

  Sample Code for queue

  Sample Code for priorityqueue

  Sample Code for concurrenthashmap

  Sample Code for vector

  Sample Code for stack

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