Ejercicio 14.8.java

// Fig. 14.8: SliderDemo.java
// Using JSliders to size an oval.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class SliderDemo extends JFrame {
   private JSlider diameterSlider;
   private OvalPanel myPanel;

   // set up GUI
   public SliderDemo() {
      super("Slider Demo");
      // set up OvalPanel
      myPanel = new OvalPanel();
      myPanel.setBackground(Color.YELLOW);
      // set up JSlider to control diameter value
      diameterSlider = new JSlider(SwingConstants.HORIZONTAL, 0, 200, 10);
      diameterSlider.setMajorTickSpacing(10);
      diameterSlider.setPaintTicks(true);

      // register JSlider event listener
      diameterSlider.addChangeListener(

            new ChangeListener() { // anonymous inner class

               // handle change in slider value
               public void stateChanged(ChangeEvent e) {
                  myPanel.setDiameter(diameterSlider.getValue());
               }
            } // end anonymous inner class
      ); // end call to addChangeListener

      // attach components to content pane
      Container container = getContentPane();
      container.add(diameterSlider, BorderLayout.SOUTH);
      container.add(myPanel, BorderLayout.CENTER);

      setSize(220, 270);
      setVisible(true);

   }// end constructor SliderDemo
}