Interview Questions and Answers for 'T' | Search Interview Question

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Q2321. 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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Q2322. Can we have NAT instance in private subnet ?

Amazon Web Services (AWS)

Ans. No

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Q2323. Have you ever worked on continuations in Java ?

Core Java

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Q2324. Write a Program to print all nodes of the data structure ?

Algorithm

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Q2325. Difference between composite , primary and unique key ?

Database

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Q2326. Which programming language you hate the most and Why ?

General

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Q2327. 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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Q2328. 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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Q2329. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q2330. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q2331. 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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Q2332. 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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Q2333. 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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Q2334. 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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Q2335. 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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Q2336. 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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Q2337. What is a difference between JUnit 3 and 4 ?

Junit

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Q2338. 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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Q2339. Code an elevator simulator.

Design

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Q2340. Implement a queue, using only stacks

Data Structure

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Q2341. How would you test a Twitter application ?

Testing

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Q2342. Write a calculator and find if a character appears more than n times ?

Design

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Q2343. Can we keep application configuration at different places and what could be the consideration for choosing multiple places for doing so ?

Design

Ans. Yes an application can have configuration stored at multiple places. Factors that could facilitate such a design could be

1. Type of config information - We may have a case to store confidential information differently than other regular config value

2. Environment - We may like to have a base config ( defined in application package ) and then a different override mechanism in different environments.

3. Centralization - Sometime some configs need to be shared across application and hence centralized.

4. Testing - Testing against config may not be possible in some enviornments in certain cases and hence additional config store might be kept for testing purpose only.

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Q2344. Do you think it's a good practice to keep passwords in config files ?

Solution

Ans. We can keep them in config as encrypted values.

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Q2345. 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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Q2346. What are the disadvantages of binary search trees?

Algorithm

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Q2347. Please explain the architecture of our application through a diagram ?

General

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Q2348. How many heaps will be there with 3 threads ?

Core Java

Ans. All threads share a common heap.

Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, you will get a stack overflow.

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Q2349. What does 'variable hoisting' mean?

JavaScript

Ans.

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Q2350. Explain when you would decide to use open authentication ?

Authentication

Ans. Google OAuth can be used when we want to grant the access of our google credentials to the service provider ( most likely a cloud-based mobile application) by using the option ' Login via Google'

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