How to make a button stop counting below 0? Java : Hi guys im stuck with this code if anyone could help me out it would be awesome

    private static String labelPrefix = "Number of 	boats added: ";
    private int numClicks = 0;
    JLabel addb = new JLabel(labelPrefix + "0    "); 
         JButton del = new JButton("Delete Boat!"); 		
    panel.add(addb);
        addb.setText(labelPrefix + --numClicks);
              		del.setVisible(true);

when delete button is pressed it counts down from labelPrefix.. but i need it to stop at 0 and not go to negative side..any ideas how i could do it without changing alot? 
