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Q2301. Which of the following - arrays or LinkedList allow elements to be accessed using index and how ?

Ans. Arrays allows elements to be accessed directly using the index.

As Array elements are stored in continuous memory locations it's very easy to find the memory address of any element using the formula as following

Memory Address of Array start or index 0 + ( Size of array element * Index )

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Q2302. Can we access elements at a particular index using LinkedList collection class ?

Ans. Yes we can. But as the underlying structure of the collection class is double linked list, it will eventually have to traverse to the element linearlly and hence would result in bad performance.

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Q2303. Can we access elements at a particular index using LinkedList collection class ?

Data Structure

Ans. Yes we can. But as the underlying structure of the collection class is double linked list, it will eventually have to traverse to the element linearlly and hence would result in bad performance.

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Q2304. Can you give an example of a Get and Post Request.

Web Service

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Q2305. Can you design a program that can identify if two shapes on x and y plane would intersect ?

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Q2306. How can we identify if we circle on a xy place would intersect ?

Ans. If the sum of their radius is greater than the shortest distance between them, then they will intersect.

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Q2307. How can we identify if two squares ( given their diagonal coordinates ) would intersect on xy plane ?

Ans. Using the diagonal coordinates we can easily calculate the other 2 coordinates using Pythagoras.

Any 2 rectangles or squares will intersect if any coordinate of one square would lie within the boundary of another one. A point x,y will be inside the square ( x1,y1;x2,y1;x1,y2;x2,y2 ) is x is between x1 and y2 and y is between y1 and y2.

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Q2308. Explain CAP Theorem.

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Q2309. Have you heard of Rest method Patch ?

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Q2310. Do you think we should have security Tokens in Url ?

Design

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Q2311. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q2312. What are the Messaging systems / technologies you have worked with ?

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Q2313. What are the different delivery policies in Apache Kafka ?

Apache Kafka

Ans. Exactly once , At least once , At max once

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Q2314. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q2315. Have you ever encoded the response before sending it back ?

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Q2316. Have you ever encoded the response before sending it back from the service? If Yes , Which encoding was used ?

Ans. In two different situations I used UTF-8 and Base 64 encodings.

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Q2317. Have you ever worked with single sign on ?

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Q2318. Can you explain JSON specification ?

JSON

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Q2319. Have you ever built an automation suite to test a cron job or command line application ?

Testing

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Q2320. How can we test invoking a command line application using Java code ?

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Q2321. Can you explain filter and collectors in java 8 ?

Core Java

Ans. Filters are used to filter object in stream on certail criteria. And collector is used to collect outcome of the stream. Collector is a terminal operation.
List numbers = List.of(1,2,3,4,5,6,7);
List evenNumbers = numbers.stream().filter(n -> n%2==0).collect(Collectors.toList());
The above code will filter out odd numbers and return the list of even number.

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Q2322. Can you explain filter and collectors in java 8 ?

Core Java

Ans. Filters are used to filter object in stream on certain criteria.
Collector is used to collect outcome of the stream. Collector is a terminal operation.
List numbers = List.of(1,2,3,4,5,6,7);
List evenNumbers = numbers.stream().filter(n -> n%2==0).collect(Collectors.toList());
The above code will filter out odd numbers and return the list of even number.

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Q2323. Write a program that identifies numbers in a list that are palindrome and perfect square ?

Core Java

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Q2324. Write a program to sort the Array of Strings

Core Java

Ans. String[] s = { "sort", "string", "array" };
Collections.sort(Arrays.asList(s));
System.out.println(Arrays.toString(s)); // [array, sort, string]

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Q2325. Explain Java collections

Core Java

Ans. Collection is a container which is used to store and manipulate the group of objects

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Q2326. Get all numbers from a collection that are both perfect square and palindome

Core Java

Ans. public static void main(String[] args){
      List<Integer> listOfIntegers = Arrays.asList(1,2,3,4,5,6,7,8,9,10,11);
      List<Integer> perfectAndPalindromeIntegers = new ArrayList<Integer>();

      for(Integer i: listOfIntegers){
         if(isPalindrome(i) && isPerfect(i)){
            perfectAndPalindromeIntegers.add(i);
         }
      }

      System.out.println(perfectAndPalindromeIntegers);
   }

   private static Boolean isPalindrome(Integer i){
      String str = String.valueOf(i);

      char[] charArray = str.toCharArray();

      int x = 0;
      int y = str.length()-1;

      while(x < y){
         if(charArray[x] != charArray[y]){
            return false;
         }
      }

      return true;
   }

   private static Boolean isPerfect(Integer i){
      for(int x=2;x<3;x++){
         if(x*x == i){
            return true;
         }
      }

      return false;
   }

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Q2327. When to use List, Set and Map in Java

Core Java

Ans. I. If we want a Collection that does not store duplicate values, then we use a Set based collection.

II. If we want to frequently access elements operations based on an index value then we use a List based collection. E.g. ArrayList

III. If we want to maintain the insertion order of elements in a collection then we use a List based collection.

IV. For fast search operation based on a key, value pair, we use a HashMap based collection.

V. If we want to maintain the elements in a sorted order, then we use a TreeSet based collection.

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Q2328. Why do you want to leave your current job ?

General

Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career

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Q2329. Do you like your work in current project ?

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Q2330. Which spring boot version are you working with ?

Spring Boot

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