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

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Q331. Please explain the architecture of our application through a diagram ?

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Q332. Design a appointment booking system for a chain of hospitals.

Design

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Q333. What are the disadvantages of binary search trees?

Algorithm

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Q334. How does one do matrix multiplication?

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Q335. What is an identity matrix ?

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Q336. How to write an iterator for an iterator of iterators?

Core Java

Ans. CustomArrayList myarrayList = new CustomArrayList();
      myarrayList.add("Value 1");
      myarrayList.add("Value 2");
      myarrayList.add("Value 3");

      for (String string : myarrayList) {
         System.out.println(string);
      }

package sample.utils;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CustomArrayList implements Iterable {

   private ArrayList mylist = new ArrayList();

   public void add(T t) {
      this.mylist.add(t);
   }

   @Override
   public Iterator iterator() {
      return new CustomIterator(mylist);
   }

   class CustomIterator implements Iterator {

      private int indexPosition = 0;
      private List internalList;

      public CustomIterator(List internalList) {
         this.internalList = internalList;
      }

      @Override
      public boolean hasNext() {
         if (internalList.size() >= indexPosition 1) {
            return true;
         }
         return false;
      }

      @Override
      public E next() {
         E val = internalList.get(indexPosition);
         indexPosition ;
         return val;
      }

   }

}

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Q337. Write a calculator and find if a character appears more than n times ?

Design

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Q338. Implement a queue, using only stacks

Data Structure

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Q339. Code an elevator simulator.

Design

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Q340. What is the minimum number of tables required to perform a SQL join?

Database

Ans. 1 , We can do self join

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Q341. What is a difference between JUnit 3 and 4 ?

Junit

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Q342. Can we have a final argument in a method ? What is the use of that if we do so ?

Core Java

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Q343. why is "".equals(str); safer than str.equals("")?

Core Java

Ans. str.equals("") this statement will throw NullPointerException if str is null where as "".equals(str) works fine even if str is null

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Q344. Write a method that would solve two problems at the same time ?

Core Java

Ans. We can return value for one problem solving or computation and set the value for other in some member element.

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Q345. Design an in memory object oriented system for a Car manufacturing Company ?

Design

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Q346. If you are asked to develop a financial system, how would you make sure that there are proper checks , balances and audits ?

Solution

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Q347. How can we take snapshots and track changes to environment variables in Elastic Beanstalk or Lambda ?

Amazon Web Services (AWS)

Ans. We can use AWS Config

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Q348. What is AWS Config service ?

Amazon Web Services (AWS)

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Q349. Can a constructor be declared static ? Why ?

Core Java

Ans. No.

When we declare a method static, it means that "this belongs to class as whole and not particular instance". The whole purpose of constructor is to initialize a object and hence there is no sense having static constructor.

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Q350. Can constructors be final ?

Core Java

Ans. No. They are never inherited and therefore are not subject to hiding or overriding.

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Q351. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q352. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q353. Which is a better way to keep environment specific configuration in AWS Lambda - Environment Variables or external service like S3 or RDS ?

Amazon Web Services (AWS)

Ans. Possible Answer - Env variable or use parameter store

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Q354. How do you manage environment specific configuration for your lambda functions ?

Amazon Web Services (AWS)

Ans. We are using Yaml for initializing configuration and Environment Variables for overriding them.

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Q355. Write a Program to print all nodes of the data structure ?

Algorithm

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Q356. Have you ever worked on continuations in Java ?

Core Java

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Q357. Can we have NAT instance in private subnet ?

Amazon Web Services (AWS)

Ans. No

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Q358. Difference between NAT Instances and NAT Gateway

Amazon Web Services (AWS)

Ans. High bandwidth and availability in NAT Gateway
NAT Gateway is completely managed by AWS
NAT Gateway is auto scalable
NAT Instance is just like EC2 instance and hence backed by security group
NAT Instance can be used as bastion host whereas NAT Gateway cannot be.

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Q359. Do we need to disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. It needs to be done for NAT Instances , not NAT gateway.

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Q360. Why should we disable source / destination check for NAT Gateway ?

Amazon Web Services (AWS)

Ans. Source / destination check means that the instance should wither be a source or end destination as a security check. The purpose of NAT Instance is to provide a gateway for internet access and hence this needs to be unchecked.

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