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Posts tagged with: Java

Getting started with Twilio Phone Services

Today I am going to talk about how to create a simple phone application using the popular Twilio API. If you don’t know what Twilio is all about then I recommend you go through their “What is Cloud Communications” section.



When I was working for Infofree I was given a task to come up with a basic SMS and Voice Authentication system using any available services out there. My two options back then was either Corvisa (now Shoretel) or Twilio. I tried to work with Corvisa and their API but, it lacked a lot of features that Twilio has. So ultimately, I decided to build the feature using Twilio. Sadly, because of economic reasons for my company my code was never live. But, in my free time I went further and used Twilio’s service to test different features.

In this tutorial I will show you how to setup basic twilio service using JAVA.

These are some of the things you will need in order for yor app to work.

  1. Twilio Account SID TWILIO_ACCOUNT_SID
  2. Twilio Authentication Token TWILIO_AUTH_TOKEN
  3. Twilio Number TWILIO_NUMBER
  4. Twilio Application SID (Optional)
  5. Twilio Agent Number (Optional)

Get API Key

Go to twilio and click on the “Get a Free API Key button”.

Get a Free API Key - Twilio

Get a Free API Key – Twilio

Go through the general registration process (should be easy). You need to verify using your phone number.

After you are done, go to Home-> Settings-> General


Get Phone Number

If you plan to use your number then you do not need to get TWILIO_NUMBER else click here and get a phone number. For trial purposes you can only use verified phone numbers.

Get a new phone number

Get a new phone number

You should see this number in your Manage Numbers section.


Things you’ll need for JAVA

If you use maven, you need to add this dependency in your pom.xml file:

If you don’t use maven, use this jar file instead: twilio-7.x.x-with-dependencies.jar

Here I will be using a properties file (db.properties) to store all my API credentials

Once you have everything setup, we can use Twilio’s API library to do various tasks.

Go ahead and download this sample code to play around some of the features.

I also created a Phone Verification system where you could verify phone using either a SMS or a Voice Call. But because it was part of my company project, I cannot share the code with you. But here is the screenshot of how it looks like.

Phone Verification using Twilio

Phone Verification using Twilio

Following are some of the examples:

Send SMS








Web Phone




Other uses are Phone Verification system, Conference Call, etc.

Array Splitting using PHP’s and Java’s in-built Array Funtion

Today, I am going to talk about something simple and useful in programming. For people who are professional programmers this might seem relatively easy but for someone who is trying to learn PHP or Java having a knowlege of how arrays work might be really useful. Especially when you have a large set of data and you need to display it in multiple columns.

So let’s talk about how to use PHP’s and Java’s inbuilt array funtion to slice a large array into smaller parts. For this tutorial, I am assuming you have some knowledge of how PHP and Java works. If not, there are hundreds of websites and books available to get basic understanding.

Scenario: I was given a task to list all the 52 US states in a page so that only the ones that are flagged as active in a table inside database is shown on the page. I had to show this in 3 columns.

# State Name Active Flag
1 Alabama 1
2 Alaska 1
3 Arizona 0
4 Arkansas 1
5 1

Result: The result should look something like this.

North Dakota

Now, the question might seem relatively easy. And we don’t necessarily need PHP or JAVA to solve this. We could also use something on client side like JavaScript. But, I’ll show how it’s done on the server side.

Query Database for Results:

We can get the list of active states from the database as follows:

For PHP you get the data as follows:

The above code connects to the database and quries the result and puts it inside the $states[] array.

In Java, you can do the same utilizing Java’s inbuilt database connection library:

The above code puts the result inside states array. Here, getConnection() actually connects to the database. You can google and read about how to connect to database in Java to understand it much better. But, the idea is simple. We utilize Java’s SQL library to automatically connect to the database. You just define all the required connection settings in a properties file (below is just an example).

Now that we have our results in an array. Let’s see how we can split the array into three sub arrays.

Array Count or Length

Before we do the actual splitting, we need to know the count of the total states in the array so that we can split the array evenly across the three arrays.

To do this, in PHP we use the inbuilt function count($array).

In Java we simply we utilize array.length property of an array.

Divisible by 3

Now that we know the array length, we need to know how to evenly distribute the states into three sets of list. The logic here is to make the length (or count) of the list divisible by 3 so that we can evenly distribute the states among three sets.

The concept of modulus is very helpful here. The modulo operation (or simply modulus) finds the remainder after division of one number by another. To check if a number is divisible by 3 or not we do the following:

  • First, we check to see if the number is even or odd.
  • If even, we add +1 and do the modulo operand on the length. This is done as number % divisor. If this outputs a number, besides 0, then we know the number is not divisible by divisor. Here we know length or count is even as $states_count % 2 gives us 0. If so, we loop and keep on adding 1 ($states_count++;) until we get a number that is divisible by 3 (loop until $states_count % 3 is not 0).
  • If odd, we test and see if this odd number is divisible by 3 ($states_count % 3 == 0). If the number is not divisible by 3 we keep adding 1 until we get a number that is divisible by 3.


In Java

Split Array in 3

Now that we have an array length that is divisible by 3, we can do the following to split the array.

In PHP we will use array_slice() method to slice into three parts. The syntax for array_slice() is

array_slice(array, starting index, length);

In Java we will use Arrays.copyOfRange method to make a copy of or split an array. The syntax for copyOfRange() is

int[] newArray = Arrays.copyOfRange(array, starting index, ending index);

And there you go! That’s how you split an array. You can split into any number using the same concept. Let me know what you think or if you have an even better way.