I have a 16x2 character LCD display and from what I can figure out it is connected to a circuit board which I am assuming is the micro controller. When I researched how to use it I found this blog [Arduino] LCD Display HJ1602A | Billwaa's Blog. It explains the terminals and gives a java code to input for displaying whatever you want it to say but I am confused how I would input the java code to the LCD. Do I need to connect it to the computer first to input the java code and then connect it to my application?