Java by API/java.awt.event/AdjustmentListener

implements AdjustmentListener

   <source lang="java">
 

import java.awt.Adjustable; import java.awt.Color; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.AdjustmentEvent; import java.awt.event.AdjustmentListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollBar; public class ScrollBarColorSelect extends JFrame implements AdjustmentListener {

 private JLabel redLabel;
 private JLabel greenLabel;
 private JLabel blueLabel;
 private JScrollBar red;
 private JScrollBar green;
 private JScrollBar blue;
 private JPanel colorPanel;
 public ScrollBarColorSelect() {
   setTitle("ColorSelect");
   setSize(300, 200);
   addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   });
   Container contentPane = getContentPane();
   JPanel p = new JPanel();
   p.setLayout(new GridLayout(3, 2,3,3));
   p.add(redLabel = new JLabel("Red 0"));
   p.add(red = new JScrollBar(Adjustable.HORIZONTAL, 0, 0, 0, 255));
   red.setBlockIncrement(16);
   red.addAdjustmentListener(this);
   p.add(greenLabel = new JLabel("Green 0"));
   p.add(green = new JScrollBar(Adjustable.HORIZONTAL, 0, 0, 0, 255));
   green.setBlockIncrement(16);
   green.addAdjustmentListener(this);
   p.add(blueLabel = new JLabel("Blue 0"));
   p.add(blue = new JScrollBar(Adjustable.HORIZONTAL, 0, 0, 0, 255));
   blue.setBlockIncrement(16);
   blue.addAdjustmentListener(this);
   contentPane.add(p, "South");
   colorPanel = new JPanel();
   colorPanel.setBackground(new Color(0, 0, 0));
   contentPane.add(colorPanel, "Center");
 }
 public void adjustmentValueChanged(AdjustmentEvent evt) {
   redLabel.setText("Red " + red.getValue());
   greenLabel.setText("Green " + green.getValue());
   blueLabel.setText("Blue " + blue.getValue());
   colorPanel.setBackground(new Color(red.getValue(), green.getValue(),
       blue.getValue()));
   colorPanel.repaint();
 }
 public static void main(String[] args) {
   JFrame f = new ScrollBarColorSelect();
   f.show();
 }

}

 </source>