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    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                                 JFileChooser fc;            int returnVal = fc.showOpenDialog(MainFrame.this);            if (returnVal == JFileChooser.APPROVE_OPTION) {                File file = fc.getSelectedFile();                //This is where a real application would open the file.                jTextArea_Status.append("Opening: " + file.getName() + ".\n");            }    }