如何从JScrollPane获取所有值？

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I have to find the longest word for each value from JScrollPane, not only a selected one. How do I get all values, without selecting anything? I have the list defined : list = new JList<String>(model);

   btnNewButton_1.addActionListener(new ActionListener() { // Run
               public void actionPerformed(ActionEvent e) {
                   String intxt = "", extxt = "";
                   intxt = list.getSelectedValue();
                   if (intxt == null) {
                       JOptionPane.showMessageDialog(null, "No chosen value", "Error",
                               JOptionPane.INFORMATION_MESSAGE);
                   } else {
                       ...