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

Very frequently asked. Usually asked with questions related to String.
  Q1. What is an Immutable Object ?Core Java
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Ans. Object that can't be changed after instantiation.

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Related Questions

  Why is String immutable in Java ?
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
  Why Char array is preferred over String for storing password?
 How is string object immutable if we can concat a string to it ?
  What is an immutable class ?
  How to implement an immutable class ?
  Does Declaring an object "final" makes it immutable ?
  What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ?
  What are advantages of stateless and / or immutable objects ?


 Q2. What is a ConcurrentHashMap ?Core Java
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Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap.

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Related Questions

  What is ConcurrentLinkedDeque ?
  What is CopyOnWriteArrayList ?
  What are the advantages and disadvantages of CopyOnWriteArrayList ?
  Name few Concurrent Collection Classes ?
  What is ConcurrentModificationException ?
  What is a BlockingQueue?
 Difference between concurrentHashMap and HashTable ?
 isnt the use of HashTable and ConcurrentHashMap the same, i.e providing synchronized map collection ?
 What is the use of java.util.concurrent package in Java ?


  Q3. 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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Related Questions

  What is the difference between Encapsulation and Abstraction?
  Difference between Composition and Inheritance ?
 What is Polymorphism in Java ?
  Difference between Overloading and Overriding ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
  What are the features of encapsulation ?
  How is Abstraction implemented in Java ?
  Difference between Encapsulation and Data Hiding ?
  Difference between Abstraction and Implementation hiding ?
  What are the examples of Abstraction in Java ?




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