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Q1201. Given the Phone keys mapping between numbers and characters as following

1 - a,b,c
2 - d,e,f

and so on, Write a Program that takes the integer as input and then print all possible combinations of characters matching those integers.

For example - 12 should return

ad,ae,af,bd,be,bf,cd,ce,cf

Design

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Q1202. What is ViewResolver in Spring MVC ?

Spring

Ans. View resolver is used to get view name from Controller and resolve the next view page

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Q1203. What is the biggest learning in any of your previous jobs ?

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Q1204. Make "I Know Java" as "I Java Know" without using any inbuilt functions.

Core Java

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Q1205. Find Fibonacci first n numbers using recursion ?

Core Java

Ans. public int fibonacci(int n) {
if(n == 0)
return 0;
else
if(n == 1)
return 1;
else
return fibonacci(n - 1) fibonacci(n - 2);
}

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Q1206. Find unique values between two arrays using single for loop ?

Core Java

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Q1207. Find Intersection/union between two arrays.

Core Java

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Q1208. Can we change return type of Overridden method ?

Core Java

Ans. Yes, we can change return type of overridden method in child class but child's return type should be sub-type of parent's return type.

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Q1209. What is garbage collection ?

Core Java

Ans. The garbage collection is a facility wherein a program runs on the Java Virtual Machine which gets rid of objects, which are not being used by a Java application anymore. It is a form of automatic memory management and recollection.

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Q1210. Which spring boot version are you working with ?

Spring Boot

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Q1211. Do you like your work in current project ?

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Q1212. 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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Q1213. 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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Q1214. 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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Q1215. 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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Q1216. 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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Q1217. Write a program that identifies numbers in a list that are palindrome and perfect square ?

Core Java

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Q1218. 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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Q1219. 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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Q1220. How can we test invoking a command line application using Java code ?

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Q1221. Have you ever built an automation suite to test a cron job or command line application ?

Testing

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Q1222. Can you explain JSON specification ?

JSON

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Q1223. Have you ever worked with single sign on ?

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Q1224. 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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Q1225. Have you ever encoded the response before sending it back ?

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Q1226. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q1227. What are the different delivery policies in Apache Kafka ?

Apache Kafka

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

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Q1228. What are the Messaging systems / technologies you have worked with ?

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Q1229. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q1230. Do you think we should have security Tokens in Url ?

Design

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