Multithreading with text input and Swing

Hey guys,
I have a lot of problems with the threads. I have a task: you have a textarea and 3 threads : the first one gets the chars, the second - the words, the third - the sentences. My problem is that it should be done in real time - as long as the user inputs, in the same the three thread must do their job and print in 3 windows. I made it - but the problem is that the threads runs only after hitting enter when you finish writing text.
Can you give me some help how can I do it ? Thanks

This is most likely a swing question, and you didn't TellTheDetails so anything I suggest is just a guess. Provide more info if this doesn't apply.

You are probably using an ActionListener to listen for changes in the text area, if you want to listen to every key press you should either use a key listener or key bindings on the text area.
http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html
http://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html