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What is Block chain and cryptocurrency

What is Blockchain and cryptocurrency

To understand more about Blockchain and cryptocurrency, lets explain about current Banking system works.

Current Banking systems : when a user does an online or ATM transaction , the centralized banking ledger verifies and confirm the authenticity of accounts. For that work, every bank or third party sites charges to user.

Blockchain is not like banking centralized ledger but this software uses a decentralized ledger across the thousands of computers and every transactions are updated in each and every ledger. That means everyone is aware of the transactions rather than a centralized bank stores all information and charges for that. There are volunteering systems who does this effort of maintaining all ledgers for block chain. 

Block chain uses cryptography mythology to protect the ledger information so that no one can modify or destroy this.

Block chain concept is utilized by Cryptocurrency , online voting system, signature system, agreement systems etc.

To know more about top rated cryptocurrency names – please click here

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Top 20 cryptocurrency 2017

Top 20 cryptocurrency 2017

bitcoin BTC
ethereum ETH
bitcoincash BCH
ethereumclassic ETC
litecoin LTC
einsteinium EMC2
dash DASH
ripple XRP
bitcoingold BTG
zcash ZEC
eos EOS
qtum QTUM
syscoin SYS
neo NEO
monero XMR
vertcoin VTC
iota IOT
powerledger POWR
omisego OMG
santiment SAN

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How to Implement Maven TestNG Selenium Grid project

How to Implement Maven TestNG Selenium Grid project

High level Steps:
note: I will be adding detailed description for each steps below,

1. Install Eclipse Editior
2. In Eclipse, navigate to “Help >> Install New Software” then install Maven plugin.
3. Create a Maven project, which will have a pom.xml having the option to add all dependencies jars.
     like TestNG, XLS API jars, Reporting jars etc.
4. Once that is made, convert the project into TestNG project that process will generate another xml file. (name it as testng.xml)
5. Now in Eclipse project, create a package and class. Write your programs in it.
6. In the testng.xml, mention the class names which will be included while run.
7. Now right click on pom.xml file and run as “Maven test” which will download dependency jars and store to project and then run the program.

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How to reverse an array in java

How to reverse an array in java

package arrays;
import java.util.Arrays;
 
public class ArrayReverse 
{  
 
public static void main(String[] args) 
{
 
int abc[] = {2, 3, 4, 5, 6,7, 8, 9, 10};
System.out.println(“Before Reverse, Arrays are like this : “+Arrays.toString(abc));
 
int temp;
int arrayloop = abc.length/2;
 
for (int i = 0; i < arrayloop; i++) 
{
temp = abc[i];
abc[i] = abc[abc.length-1-i];
abc[abc.length-1-i] = temp;
}
System.out.println(“After Reverse, Arrays are like this  : “+Arrays.toString(abc));
 
 
}
}
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What is LinkedList and an example in Java?

What is LinkedList and an example in Java?

LinkedList is a linear collections of data elements.

     // Declaring LinkedList

       LinkedList<String> abclinked = new LinkedList<String>();

 

 

       abclinked.add(“a”);

       abclinked.add(“b”);

       abclinked.add(“c”);

   

system.out.println(“the linked list is ” + abclinked )

 

 

Linked Lists are Dynamic size and this feature certainly has an endge over Array. insertion and deletion also possible for Linked Lists which may not be done on Array which is already defined.

 

 

The downside of Linked Lists is that the extra memory space for a pointer is required with each element of the list. Also accessing elements are sequential manner starting from the first node is difficult.

How to reverse an array in java – Please click here

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What is Thanksgiving?

What is Thanksgiving?

Thanksgiving is a national holiday of USA, Canada etc. In USA, it is celebrated on 4th Thursday of November. This day is to give thanks for the blessing of the harvest. Modern Thanksgiving has been changed a lot. Everyone are curious about the Thanksgiving deals 🙂 and it has been well celebrated as a holiday. Most of the organization gives holidays on 4th Thursday & Friday of November making it a long weekend. One can look for Thanksgiving recipes, deals, restaurants to make the holidays more enjoyable.

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What is DevOps?

What is DevOps?

DevOps is the latest Development Methodology where Dev team and Operations team are collaborated for better productivity , Improving the time to market of the product releases etc.

DevOps uses lots of tool like Git for Version controlling , Jenkins for Integrating multiple DevOps tools, helps on better communications between Developers, Testers, Operations team etc. Selenium is another tool used as part of DevOps which is a test automation and Jenkins controls and manages Selenium execution.

Puppet is another DevOps tool used for configuration management. Configuration script will be stored in puppet server and puppet agents on various VMs or target machines will be communicating puppet master. There are build management tools like Maven will be part of DevOps. Nagios is another DevOps tool which monitors systems, servers, infrastructures to make sure the deployed applications are running on production servers without any issues.

For testing specific requirements, Jenkins will help to send notification to Tester when a build is available for testing. Jenkins will trigger the selenium scripts and after execution, the results will be send out to target users including developers, management teams etc.

 

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How to use JMeter for login authentication?

How to use JMeter for login authentication?

Regular Expression Extractor is used to handle this situation. Following steps may be used,

  1. First find out the GET request where the authentication required & POST request that posts the credential to login
  2. The response from the GET request should have tokens which needs to be be extracted and sent as a parameter in the POST request.
  3. Add a Regular Expression Extractor to store these tokens and include the tokens as parameter in the POST request
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What is polymorphism in java with example

What is polymorphism in java with example

polymorphism means one object can take multiple forms. lets explain this using a method poly() in java class.

steps:

  1. create a package polymorphismPkg in eclipse
  2. create a class polymorphismClass  in eclipse
  3. now write below code in the class polymorphismClass  

package polymorphismPkg;

public class polymorphismClass {

public static void main(String[] args) {

polymorphismClass obj1 = new polymorphismClass();

obj1.poly(1, 2);
obj1.poly(1, 2, 3);
obj1.poly(1, 22.11);

}

public static void poly(int a, int b)

{
System.out.println(“this is first method for polymorphism”);
}

public static void poly(int n, int b, int c)

{
System.out.println(“this is like first method but number of argument is different in signature “);

}

public static void poly(int n, double b)

{
System.out.println(“this is like first method but argument order is different in the signature “);

}

}