Interview Questions and Answers for 'AT' | Search Interview Question

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Q901. Design ATM machine application using oops.

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Q902. What are the components of Data Warehousing ?

Database

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Q903. Difference between Eager and Lazy loading in hibernate ?

Hibernate

Ans. Lazy Loading is loading of entities on demand when subclass is called, while Eager loading is loading of all the sub entity at the start only.

Eager loading is fast as all sub entities are already present, but its heavy(takes more memory)

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Q904. Create a stack of specific size using arrayList?

Data Structure

Ans. public class StackUsingArrayList {
   public static void main(String[] args) {
      List list = new ArrayList();
      list.add("A");
      list.add("B");
      list.add("C");

      Stack stack = new Stack();

      list.forEach(a -> stack.add(a));
      System.out.println(stack);

   }
}

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Q905. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q906. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

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Q907. How are hash codes generated ?

Data Structure

Ans. Use hashCode() which returns an integer value, generated by a hashing algorithm

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Q908. Difference between Arrays and LinkedList ?

Data Structure

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Q909. Which of the following - arrays or LinkedList allow elements to be accessed using index and how ?

Data Structure

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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Q910. 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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Q911. What is your role in current project ?

General

Ans. Possible Answer - Java Developer

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Q912. Have you ever built an automation suite to test a cron job or command line application ?

Testing

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Q913. 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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Q914. 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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Q915. 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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Q916. Find unique values between two arrays using single for loop ?

Core Java

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Q917. 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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Q918. Can you explain the recent bug in your project and how you fixed it.

General

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Q919. What is the structure of your team ?

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Q920. Math.round method rounds the decimal to an integer by stripping off the decimal places. How can we use the same method to keep only 2 decimal places

For example -

Math.round(12.3456) will return 12. What should we do to get 12.34 without using any other class or method.

Core Java

Ans. We can multiply the value by 100 and then use Math.round on that and then divide the result by 100

For example -

(Math.round(12.3456 * 100)) / 100

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Q921. If a stack is implemented using an array, which end (head or tail) should represent the top ?

Data Structure

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Q922. If a stack is implemented using linkedlist, which end (head or tail) should represent the top ?

Data Structure

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Q923. Describe how a queue is usually created using sequential allocation.

Data Structure

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Q924. What is the "multiplicative congruence" method for determining where an element belongs in a hash table ?

Data Structure

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Q925. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?

Algorithm

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Q926. What is the access time for ArrayList and LinkedList ?

Data Structure

Ans. O(1) for ArrayList
O(n) for LinkedList

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Q927. Write a method that returns maximum depth of a tree ?

Algorithm

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Q928. What is the difference between Observer and Subscriber ?

Design

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Q929. What can we do if we need to retrieve Fibonacci value at a particular index faster ? Can we use Linked List ?

Data Structure

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Q930. What is the difference between save() and persist() in hibernate ?

Hibernate

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