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   How to display a text file from a GUI?

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The easiest way to do this is to use a JTextArea to display the text. Then you can just load the text into the text area by using:

JTextArea textArea = new JTextArea(5, 20);
JScrollPane scrollPane = new JScrollPane( textArea );

Then you can display the scroll pane in your GUI.

Of course you will want to create a FileReader object first. Check out the API or search the forums for more information on using a FileReader or BufferedReader.