/* ButtonApplet5 shows how panels can be nested. */



       import java.applet.*;
       import java.awt.*;
   
       public class ButtonApplet5 extends Applet {

           Button redButton    = new Button("Red");
           Button yellowButton = new Button("Yellow");
           Button orangeButton = new Button("Orange");
           Button blackButton  = new Button("Black");
           Button blueButton   = new Button("Blue");
           Button whiteButton  = new Button("White");

           Panel colorPanel;
           Panel buttonPanel;

           public void init() {

               setLayout(new GridLayout(2, 1));  // Applet has
                                                 // 2 row, 1 cols

               buttonPanel = new Panel();
               buttonPanel.setLayout(new GridLayout(2, 3));
               buttonPanel.add(redButton);
               buttonPanel.add(yellowButton);
               buttonPanel.add(orangeButton);
               buttonPanel.add(blackButton);
               buttonPanel.add(blueButton);
               buttonPanel.add(whiteButton);

               colorPanel = new Panel();
               colorPanel.setBackground(Color.white);

               add(colorPanel);      // add colorPanel to applet
               add(buttonPanel);     // add buttonPanel to applet
               

           }

           public boolean action(Event evt, Object arg) {
              if (evt.target instanceof Button) {
                 if (evt.target == redButton)
                    colorPanel.setBackground(Color.red);
                 else if (evt.target == yellowButton)
                    colorPanel.setBackground(Color.yellow);
                 else if (evt.target == orangeButton)
                    colorPanel.setBackground(Color.orange);
                 else if (evt.target == blackButton)
                    colorPanel.setBackground(Color.black);
                 else if (evt.target == blueButton)
                    colorPanel.setBackground(Color.blue);
                 else
                    colorPanel.setBackground(Color.white);
                 colorPanel.repaint();
                 return true;
              }
              return false;
           }
       }