MULTI_SELECTION_ENABLED_CHANGED_PROPERTY

public static final String MULTI_SELECTION_ENABLED_CHANGED_PROPERTY

Enables multiple-file selections.

See Also:

Constant Field Values

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You can have your JFileChooser select multiple files and return an array of File objects instead of one

JFileChooser chooser = new JFileChooser();chooser.setMultiSelectionEnabled(true);chooser.showOpenDialog(frame);File[] files = chooser.getSelectedFiles();

The method showOpenDialog(frame) only returns once you click the ok button

EDIT

So do this:

JFileChooser chooser = new JFileChooser();chooser.setMultiSelectionEnabled(true);chooser.showOpenDialog(frame);File[] files = chooser.getSelectedFiles();if(files.length >= 2) {    compare(readFileAsList(files[0]), readFileAsList(files[1]));}

And change your readFileAsList to:

private static List
    
      readFileAsList(File file) throws IOException {    final List
     
       ret = new ArrayList
      
       ();    final BufferedReader br = new BufferedReader(new FileReader(file));    try {        String strLine;        while ((strLine = br.readLine()) != null) {            ret.add(strLine);        }        return ret;    } finally {        br.close();    }}