Swing Slider Example

I wrote a Slider 'Hello World' program to make sure I understand how to use them to control another value in the user interface.

Here is that self contained simple example.

package ca.sarah_happy.sandbox.circles;

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class SliderSample implements Runnable {
    public static void main(String[] args) {
        /*
         * do all the work on the GUI thread.
         */
        SwingUtilities.invokeLater(new SliderSample());
    }

    /*
     * things I will need access to later.
     */

    private JSlider slider;
    private JLabel label;

    /*
     * do the work of creating the user interface.
     */

    @Override
    public void run() {
        slider = new JSlider();
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.setMaximum(127);
        slider.setMinimum(-128);
        slider.setMajorTickSpacing(32);
        slider.setMinorTickSpacing(8);
        slider.setValue(0);

        label = new JLabel("value = " + slider.getValue());

        JFrame frame = new JFrame("Slider Sample");
        frame.setLocationByPlatform(true);
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        Container p = frame.getContentPane();
        p.add(label, BorderLayout.SOUTH);
        p.add(slider);

        slider.addChangeListener(sliderChangeListener);

        frame.pack();
        frame.setVisible(true);
    }

    /*
     * and things that will be triggered later
     */

    private ChangeListener sliderChangeListener = new ChangeListener() {
        @Override
        public void stateChanged(ChangeEvent e) {
            String adjust = "";
            if (slider.getValueIsAdjusting()) {
                adjust = " (adjusting)";
            }
            label.setText("value = " + slider.getValue() + adjust);
        }
    };
}