Java SE (Java Platform, Standard Edition)

Hi folks.

At the moment my program does this:

The user can drag and drop images into an environment which corresponds creates a Java file.
So there is a panel that the user can drag images from and drop them to another panel. This in turn creates a Java file which is displayed at run time in a JTextArea.

I would like to use syntax highlighting here. I have come across a couple of similar questions in this forum but so far haven't found a great example.
Can anyone please point me to a good tutorial/example?

Many thanks.