The next thing we want to do is make the text on the screen dynamic by adding serial communication. At the beginning, the text was static and defined as the HelloWorld variable. Now we have changed it to be a dynamic parameter of our setText function, but the way we use it is still static, because we just pass the "Hello display" static text to it via setText("Hello display");.
To make use of the serial port, let's find an example first that reads in a string from the serial port. We will then integrate it into our sketch. All the serial port examples can be found under File | Examples | 04.Communication.
Sadly, there is none that receives an input string and then does something with it.