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Q631. Pascal Triangle Program

Ans. package snippet;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Pascal {
   public static void main(String[] args) {

      System.out.println(generatePascalTriangle(5));

   }

   static Map> generatePascalTriangle(int size) {
      Map> triangle = new HashMap<>();

      triangle.put(0, Arrays.asList(1));
      triangle.put(1, Arrays.asList(1, 1));

      for (int i = 2; i <= size; i ) {
         List coeffListForI = new ArrayList<>();
         List coeffListForI_1 = triangle.get(i - 1);
         coeffListForI.add(1);
         for (int j = 0; j <= coeffListForI_1.size() - 2; j ) {
            coeffListForI.add(coeffListForI_1.get(j) coeffListForI_1.get(j 1));
         }
         coeffListForI.add(1);
         triangle.put(i, coeffListForI);
      }

      return triangle;
   }
}

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Q632. Which is the best approach that provides the lowest cost for Amazon elastic block store snapshots while giving you the ability to fully restore data?

aws ebs

Ans. Maintain the most current snapshot; archive the original and increment to Amazon Glacier.

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Q633. What is the cost of using Cloud Formation ?

Amazon Web Services (AWS)

Ans. Cloud Formation does not have any additional cost but you are charged for the underlying resources it builds.

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Q634. How many requests per second can Amazon CloudFront handle?

Amazon Web Services (AWS)

Ans. 10000

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Q635. What is elasticity in relation to Cloud infrastructure ?

Cloud Computing

Ans. The power to scale computing resources up and down easily with minimal friction

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Q636. With regards to VPC, what is the default maximum number of virtual private gateways allowed per region?

Amazon Web Services (AWS)

Ans. 5

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Q637. A customer has a website which is accessible over the Internet and he wants to secure the communication and decides to implement HTTPS instead of HTTP. He has configured EC2 instance behind an ELB. Where should you configure the SSL certificate?

Amazon Web Services (AWS)

^{This question is still unanswered. Can you please provide an answer.}

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Q638. what is salesforce ?

SalesForce

Ans. Salesforce is the cloud based #1 CRM (Customer Relationship Management)

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Q639. Explain different inheritance mapping strategies with JPA / Hibernate.

Hibernate

Ans. table per hierarchy
table per concrete class
table per sub class

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Q640. How to parse nested json object ?

JSON

Ans. JSONObject jsonChildObject = (JSONObject)jsonObject.get("LanguageLevels");

for (Map.Entry in jsonChildOBject.entrySet()) {
System.out.println("Key = " entry.getKey() ", Value = " entry.getValue());
}

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Q641. How to avoid cloning, serialization in the singleton class ?

Design

Ans. For Cloning-exception,For deserialization-read.resolve()

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Q642. Why did you apply for this position?

General

^{This question was recently asked at 'NIC inc'.This question is still unanswered. Can you please provide an answer.}

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Q643. How to calculate distance between 2 points using latitude longitude ?

Algorithm

^{This question was recently asked at 'Trimble'.This question is still unanswered. Can you please provide an answer.}

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Q644. Can comments be added in JSON ?

JSON

Ans. No, It should all be data.

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Q645. What is input Stream ?

Core Java

^{This question was recently asked at 'SQUAD Infotech'.This question is still unanswered. Can you please provide an answer.}

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Q646. What will happen if there are no collections in java ?

Core Java

Ans. Collections in Java is nothing but a library implementation for data structures and algorithm. If it's not available , we might have to include some other library or provide our own implementation.

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Q647. What will happen if there are no enums in Java ?

Core Java

Ans. Enums in Java is a facility to have objects upfront and use them as constants. Even if such a facility is not available , a workaround could be achieved.

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Q648. What will happen if there are no interfaces in Java ?

Core Java

Ans. Abstract classes can take care of that to a certain extent. Though they are little heavier than Interfaces but An abstract class with all abstract methods and no instance variables will be able to help with everything that currently an interface does.

The only problem is that a class can only extend one class whereas it can implements multiple interfaces and that is the reason Interfaces were introduced in Java, i.e to get over the problem of multiple inheritance.

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Q649. What are the different ways to create objects in Java ?

Core Java

Ans. 1. Using new operator
3. Using Class.forName or Reflection
4. Using clone
5. Using Deserialization

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Q650. Can we create object in static block ?

Core Java

^{This question was recently asked at 'DXC Technologies'.This question is still unanswered. Can you please provide an answer.}

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Q651. Can you tell me any 10 unix command you have worked with ?

Unix

Ans. grep, ls, kill, vi , scp , wget,telnet, zip, unzip,mv,cp

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Q652. Implement a Stack with 2 threads in which one thread push data and another pop data.

Data Structure

^{This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer.}

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Q653. What are the 7 OSI LAYERS ?

Networking

Ans. Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

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Q654. Does it make sense to mock integration calls during stress / load test ?

Testing

Ans. No, its usually not done.

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Q655. Explain servlet lifecycle

Java EE

Ans. Init -> service -> destroy.

Out of these, init and destroy are called once per servlet whereas service is called every time when a request is made to the servlet.

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Q656. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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Q657. What is XSS or Cross site scripting ?

Security

Ans. XSS or cross site scripting is a javascript vulnerability in web applications. The easiest way to explain this is with a case when the user enters a script in the client side input fields and that input gets processed without getting validated. This leads to untrusted data getting saved and executed on the client side.

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Q658. in the following class:
class A {
void methoda(Object o) {
Sysout("Object");
}

void methoda(String s) {
Sysout("String");
}

public static void main(String []args) {
A a = new A();
a.methoda(null);
}
}

what will be printed?

Core Java

Ans. String

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Q659. How many read and write operations are provided at the same time by ConcurrentHashMaps ?

Core Java

Ans. ConcurrentHashMaps provide unlimited read operation fro multi threaded environment. For write operation only one thread can change value for particular segment of map.

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Q660. what is volatile and atomic

Core Java

Ans. When you declare a member/variable as volatile, you are forcing threads to read values from main memory instead of thread memory.

When you declare as atomic, the read and update/write operations are performed as a single unit. A lock is acquired during atomic operation.

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