Java How to Program, Early Objects, 11th Edition

... javax.swing.SwingConstants; 8   import javax.swing.event.ChangeListener;
 9   import javax.swing.event.ChangeEvent;
10
11   public class SliderFrame extends JFrame
12   {
13     private final JSlider diameterJSlider; // slider to select diameter
14     private final OvalPanel myPanel; // panel to draw circle
15
16     // no-argument constructor
17     public SliderFrame()
18     {
19        super("Slider Demo");
20
21        myPanel = new OvalPanel(); // create panel to draw circle
22        myPanel.setBackground(Color.YELLOW);
23
24        // set up JSlider to control diameter value
25        diameterJSlider =
26           new JSlider(SwingConstants.HORIZONTAL, 0, 200, 10);
27    diameterJSlider.setMajorTickSpacing(10); // create tick every 10
28    diameterJSlider.setPaintTicks(true); // paint ticks on slider
29
30 ...