Implement a custom model and a custom editor for JSpinner in Java

/*from  w w w .  j  a  v a  2s  .c o  m*/
/*
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
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import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

class GrayModel extends SpinnerNumberModel {
  public GrayModel(int value) {
    super(value, 0, 255, 5);
  }

  public int getIntValue() {
    Integer myValue = (Integer) getValue();
    return myValue.intValue();
  }

  public Color getColor() {
    int intValue = getIntValue();
    return new Color(intValue, intValue, intValue);
  }
}

class GrayEditor extends JLabel implements ChangeListener {
  public GrayEditor(JSpinner spinner) {
    setOpaque(true);

    // Get info from the model.
    GrayModel myModel = (GrayModel) (spinner.getModel());
    setBackground(myModel.getColor());
    spinner.addChangeListener(this);

    // Set tool tip text.
    updateToolTipText(spinner);

    // Set size info.
    Dimension size = new Dimension(60, 15);
    setMinimumSize(size);
    setPreferredSize(size);
  }

  protected void updateToolTipText(JSpinner spinner) {
    String toolTipText = spinner.getToolTipText();
    if (toolTipText != null) {
      // JSpinner has tool tip text. Use it.
      if (!toolTipText.equals(getToolTipText())) {
        setToolTipText(toolTipText);
      }
    } else {
      // Define our own tool tip text.
      GrayModel myModel = (GrayModel) (spinner.getModel());
      int rgb = myModel.getIntValue();
      setToolTipText("(" + rgb + "," + rgb + "," + rgb + ")");
    }
  }

  public void stateChanged(ChangeEvent e) {
    JSpinner mySpinner = (JSpinner) (e.getSource());
    GrayModel myModel = (GrayModel) (mySpinner.getModel());
    setBackground(myModel.getColor());
    updateToolTipText(mySpinner);
  }
}

public class Main extends JPanel {
  public static void main(String[] args) {
    JFrame frame = new JFrame("SpinnerDemo4");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JComponent newContentPane = new Main();
    newContentPane.setOpaque(true);
    frame.setContentPane(newContentPane);

    frame.setLayout(new FlowLayout());
    frame.add(new JLabel("Shade of Gray:"), "North");
    frame.add(new JSpinner(new GrayModel(170)));

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

}