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Q361. Is HashMap Synchronized ?

Core Java

Ans. No HashMap isn't synchronized. ConcurrentHashMap and Hashtable are synchronized.

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Q362. Can we use Param Store with AWS Lambda ?

Amazon Web Services (AWS)

Ans. Yes

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Q363. What measures would you take to avoid Java threading issues in a multi-threaded environment ?

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Q364. Does abstract class have public constructor?

Core Java

Ans. Yes, an abstract class can have a constructor in Java.

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Q365. 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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Q366. Why Hadoop serialized data types are not using in Spark serialization ?

BigData

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Q367. 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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Q368. What does 'variable hoisting' mean?

JavaScript

Ans.

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Q369. 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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Q370. Please explain the architecture of our application through a diagram ?

General

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Q371. What are the disadvantages of binary search trees?

Algorithm

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Q372. 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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Q373. How would you test a Twitter application ?

Testing

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Q374. Implement a queue, using only stacks

Data Structure

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Q375. Code an elevator simulator.

Design

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Q376. 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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Q377. What is a difference between JUnit 3 and 4 ?

Junit

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Q378. 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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Q379. 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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Q380. 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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Q381. Design an in memory object oriented system for a Car manufacturing Company ?

Design

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Q382. Which maven commands you usually work with ?

Maven

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Q383. How can you prove your honesty ?

General

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Q384. 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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Q385. 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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Q386. What is AWS Config service ?

Amazon Web Services (AWS)

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Q387. 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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Q388. 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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Q389. Can we ssh into subnet without a internet gateway ?

Amazon Web Services (AWS)

Ans. No

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Q390. Can we load Yaml files into AWS DynamoDB ?

Amazon Web Services (AWS)

Ans. No

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