My Calculator API in Java

I just created a Calculator API in java. Here I am describing step by step.

Creating a java project

How I am using my Symphony mobile as android emulator

I am using my symphony android mobile(model roar e80) as emulator. But first I couldn't figure out how to use that. But now I can. I have followed some simple steps to use it as an emulator.

Step 1: I connected my symphony phone as USB with my desktop PC and in USB option selected USB Virtual Device. (Most probably it has nothing to select USB Virtual Device, Hence it work in Media device file transfer)
Step 2: In settings option under about phone, I tapped it several time to activate developer option. and turn on it and turn on USB debugger.
Step 3: In eclipse, as run configurations under target selected "always prompt to pick device" and run my application.
NB: For android studio it's automatically detect the device if USB debugger is on.

And finally I can run my application on my symphony device.