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Q181. What are different types of dependency injections ?

Design

Ans. Setter injection
Constructor injection
Interface injection
Look-up method/method injection

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Q182. Which objects are eligible for garbage collection ?

Core Java

Ans. Objects that have lost their reference i.e. they cannot be accessed/used by the program anymore.

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Q183. Explain what happens when insertion is performed in case of ArrayList and LinkedList.

Data Structure

Ans. Array List works on Array and when we add an element in middle of the list, Array List need to update the index of all subsequent elements. I the capacity is full, it even may need to move the whole list to a new memory location . Linked List works on Double linked list algorithm and all it has to do is to adjust the address of the previous and next elements.

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Q184. How does relational database facilitates read optimization ?

Database

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Q185. Does relational database facilitate read or write optimization while storing information ?

database

Ans. Usually Relational Databases are optimized for writing. Some exception being usage of indices where indices needs to be updated after insertion and eventually helps with Log(n) reading time.

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Q186. What is read and write optimization in relation to databases ? Which database facilitates read optimization and which facilitates write optimization ?

Database

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Q187. What is abstraction ?

Design

Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user.

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Q188. Can you explain software design principles cohesion and coupling with an example?

Design

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Q189. Can you write the code for implementing the one to many (student -> courses) relationship in hibernate?

Hibernate

Ans. @OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "student_id")
private Set countries;

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Q190. Suppose we have a string "Java is object oriented language" and we have to reverse every alternate word in string. How would we do that using Java program.

Core Java

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Q191. How is LinkedList collection class internally implemented ? Is it a Linked List or Doubly Linked List ?

Core Java

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Q192. Which of the two - Arrays or LinkedList - is a better data structure for implementing Queue ? and Why ?

Data Structure

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Q193. Which immutable classes have you worked with ? Can you name some immutable Collections ? How to make an immutable collection ?

Core Java

Ans. string and wrapper class objects

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Q194. What is a BlockingQueue ?

Core Java

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Q195. Which Data structure can be used for creating Queue ?

Data Structure

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Q196. How can we ensure thread safety in static method ?

Core Java

Ans. By using synchronized static method or synchronized block

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Q197. Can we use primitive types with Collection classes ?

Core Java

Ans. No, As collection classes involve use of Generics, they cannot accept primitive types.

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Q198. Write a Program to print fibonacci series using recursion.

Core Java

Ans. public class FibonacciUsingRecursion {
   public static void main(String[] args) throws IOException{
      getNextFibanocci(1,1);
   }

   static int getNextFibanocci(int a,int b){
      if(a+b >= 100){
         return 0;
      } else {
         System.out.println(a+b);
         getNextFibanocci(b,a+b);
      }

      return 0;
   }
}

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Q199. What could be the driving force to have dependencies injected through class than through config file while using IOC or Dependency Injection ?

Design

Ans. Unit Testing

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Q200. Which of the following databases - Cassandra / Oracle - provides more flexibility about querying the database ?

Database

Ans. Oracle as it is not modeled for a particular query or set of queries.

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Q201. Which of the two Normalization / Denormalization facilitate better performance ? Which of the two facilitate better space management ?

Database

Ans. DeNormalization facilitate better performance. Normalization remove data duplication and hence facilitate better database space management.

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Q202. Difference between Normalization and Denormalization ?

Database

Ans. Normalization is the process of splitting one Table into multiple so as to avoid Data duplication whereas Denormalization is the process of reducing Tables that creates data duplication but would remove joins in the queries.

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Q203. How different is the Search algorithm when we query Cassandra Tables and When we query Oracle Tables ?

Cassandra

Ans. Relational Database uses linear search if we don't query using indices. Performance for linear search is O(n). If indices have been used , relational database uses binary search. Performance for binary search is O(Log n).

Casandra uses hash search. Performance for Hash Search is O(1).

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Q204. Which validation frameworks have you worked on ?

Frameworks

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Q205. Explain Hibernate Validation ?

Hibernate

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Q206. Which of the two - iteration or recursion - is slower ?

Core Java

Ans. Any function call is slower than the code in the same method as Java has to maintain stack of meta and function call information. So recursion is slower.

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Q207. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it.

Unix

Ans. chmod 477

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Q208. Is dependency injection possible if we don't have inheritance / Composition ?

Design

Ans. Without composition - No, as it's the core of dependency injection.

With Inheritance - Yes, through interface implementation.

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Q209. Which of the OOP's features facilitate dependency injection ?

Design

Ans. Inheritance , Runtime Polymorphism and Composition.

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Q210. Lets say we have a set "set1" with objects of Class A, Class has a non static string called element1, Write a code ( using lambda expression ) to see if there is any object in the set with element1 = "Hello".

Core Java

Ans. set1.stream().filter(p->p.element1.equals("Hello")).findAny().isPreent();

or

set1.stream().map(A::getElement1).anyMatch("Hello"::equals)

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