Welcome to the IoT (Internet of Things) world. There is no doubt that you hear this term around all the time. IoT has become a hot topic of late, and for good reason too. Some estimates put the number of connected small devices somewhere around 9 billion currently; it's projected to jump to 24 billion devices by 2020. While the projections vary, the assessment really doesn't: in terms of sheer numbers, the IoT is going to dwarf any computing models ever seen.

Very closely related to the IoT world, we have the Raspberry Pi—a credit card-sized microcomputer designed by the Raspberry Pi Foundation for experimentation and education.

What you should know about the Raspberry Pi is that it is nothing but a small computer. Small power requirements, small physical size, small memory, and most importantly a low-cost device. Everything about it is small, but it is still just a computer and it uses Linux.

Java was made for IoT from the first day...