If, for example you want an application to support the dragging of files from a file list to your component, and your component to open those files, use the following code:
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Undo / Redo functionality can be added to document classes in the javax.swing.text package very easily. All you need to do is add a listener for changes, and use a UndoManager to alter those changes.
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In order to read a text file, you can use the BufferedReader class in the java.io package. The following simple class starts up,
reads a text file and prints each line to the screen, then closes the text file and exits.
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