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Q2701. Difference between composite , primary and unique key ?

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Q2702. Which programming language you hate the most and Why ?

General

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Q2703. 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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Q2704. 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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Q2705. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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Q2706. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q2707. 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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Q2708. 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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Q2709. What is AWS Config service ?

Amazon Web Services (AWS)

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Q2710. 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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Q2711. 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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Q2712. How can you prove your honesty ?

General

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Q2713. Which maven commands you usually work with ?

Maven

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Q2714. Design an in memory object oriented system for a Car manufacturing Company ?

Design

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Q2715. 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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Q2716. 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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Q2717. 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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Q2718. What is a difference between JUnit 3 and 4 ?

Junit

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Q2719. 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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Q2720. Code an elevator simulator.

Design

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Q2721. Implement a queue, using only stacks

Data Structure

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Q2722. How would you test a Twitter application ?

Testing

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Q2723. 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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Q2724. What are the disadvantages of binary search trees?

Algorithm

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Q2725. Please explain the architecture of our application through a diagram ?

General

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Q2726. 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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Q2727. What does 'variable hoisting' mean?

JavaScript

Ans.

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Q2728. 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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Q2729. Why Hadoop serialized data types are not using in Spark serialization ?

BigData

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Q2730. Explain CloneNotSupportedException ?

Core Java

Ans. If we do not mention, Cloneable Interface to the Class which we want to Clone then we get this exception, only if we try to clone an object

Like:
public class TestClone{
@Override
   protected Object clone() throws CloneNotSupportedException {
      return super.clone();
   }
}

In Main, You try to do:
TestClone clone = new TestClone();

      TestClone clone2 = (TestClone) clone.clone();

You will get CloneNotSupportedException.

Just add -> public class TestClone implements Cloneable {

and things are fixed.

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