Seeing Code in applet

Hello!
I need to design an applet for school. I use Swing.
What i need to do is an algorithm for BFS.(Breadth first search)
-the top pane should contain a text area for inputting data, and buttons to trigger the operations: insert, delete, search
-the left pane should show graphically the operations
-the right pane should display code, highliting the execution
-the bottom pane should show the status info

How can i display code in a JPane to highlite the execution? I appreaciate your ideas!

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