Исходный текст аплета Options представлен в листинге 1.

Листинг 1. Файл Options.java

import java.applet.*;
import java.awt.*;

public class Options
extends Applet { FirstPanel pPanel1; CardPanel pCard; ControlPanel pControl;

public String getAppletInfo() { return "Name: Options"; } Некоторые свойства волн
да Бройля

 public void init() { setLayout(new
GridLayout(3, 1));

 pPanel1 = new FirstPanel();
add(pPanel1);

 pCard = new CardPanel(pPanel1);
add(pCard);

 pControl = new ControlPanel(pCard);
add(pControl);

 pPanel1.setBackground(Color.yellow);
pPanel1.setForeground(Color.black);

 repaint();
} }

class FirstPanel extends Panel { String
szFontName = "TimesRoman";

 public void
paint(Graphics g) { Dimension dimAppWndDimension = getSize();

g.drawRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1);

g.setFont(new Font(szFontName, Font.PLAIN, 24)); g.drawString("First panel", 10,
50);

 super.paint(g); } }

class
CardPanel extends Panel { Panel pBgColor; Panel pFgColor; Panel pFont;

Panel pControlled;

 Choice chBgColor; Choice
chFgColor; Choice chFont;

 Label lbBgColor;
Label lbFgColor; Label lbFont;

 public
CardPanel(Panel pControlledPanel) { pControlled = pControlledPanel;

setLayout(new CardLayout(5, 5));

 pBgColor
= new Panel(); pFgColor = new Panel(); pFont = new Panel();

add("BgColor", pBgColor); add("FgColor", pFgColor); add("Font", pFont);

chBgColor = new Choice(); chFgColor = new Choice(); chFont = new Choice();

chBgColor.add("Yellow"); chBgColor.add("Green"); chBgColor.add("White");

chFgColor.add("Black"); chFgColor.add("Red"); chFgColor.add("Green");

chFont.add("TimesRoman"); chFont.add("Helvetica"); chFont.add("Courier");

lbBgColor = new Label("Background color"); lbFgColor = new Label("Foreground color");
lbFont = new Label("Font");

 pBgColor.add(lbBgColor);
pBgColor.add(chBgColor);

 pFgColor.add(lbFgColor);
pFgColor.add(chFgColor);

 pFont.add(lbFont);
pFont.add(chFont); } 

 public void paint(Graphics
g) { Dimension dimAppWndDimension = getSize(); g.drawRect(0, 0, dimAppWndDimension.width
- 1, dimAppWndDimension.height - 1);

 super.paint(g);
}

 public boolean action(Event evt, Object
obj) { Choice ch; 

 if(evt.target instanceof
Choice) { ch = (Choice)evt.target;

 if(evt.target.equals(chBgColor))
{ if(ch.getSelectedIndex() == 0) pControlled.setBackground( Color.yellow);

else if(ch.getSelectedIndex() == 1) pControlled.setBackground( Color.green);

else if(ch.getSelectedIndex() == 2) pControlled.setBackground( Color.white); }
else if(evt.target.equals(chFgColor)) { if(ch.getSelectedIndex() == 0) pControlled.setForeground(
Color.black);

 else if(ch.getSelectedIndex()
== 1) pControlled.setForeground( Color.red);

else if(ch.getSelectedIndex() == 2) pControlled.setForeground( Color.green); }
else if(evt.target.equals(chFont)) { if(ch.getSelectedIndex() == 0) ((FirstPanel)pControlled).szFontName
= "TimesRoman";

 else if(ch.getSelectedIndex()
== 1) ((FirstPanel)pControlled).szFontName = "Helvetica";

else if(ch.getSelectedIndex() == 2) ((FirstPanel)pControlled).szFontName = "Courier";
} else { return false; } pControlled.repaint();

return true; } return false; } }

class
ControlPanel extends Panel { Button btNext; Button btPrev; Button btBgColor; Button
btFgColor; Button btFont; Panel pCard;

public ControlPanel(Panel pCardPanel) { pCard = pCardPanel; setLayout(new GridLayout(2,3));

btBgColor = new Button("Background Color"); btFgColor = new Button("Foreground
Color"); btFont = new Button("Set Font"); btNext = new Button("Next"); btPrev
= new Button("Prev");

 add(btBgColor);
add(btFgColor); add(btFont); add(btNext); add(btPrev); }

public boolean action(Event evt, Object obj) { if(evt.target instanceof Button)
{ if(evt.target.equals(btBgColor)) { ((CardLayout)pCard.getLayout()).show( pCard,
"BgColor"); } else if(evt.target.equals(btFgColor)) { ((CardLayout)pCard.getLayout()).show(
pCard, "FgColor"); } else if(evt.target.equals(btFont)) { ((CardLayout)pCard.getLayout()).show(
pCard, "Font"); } else if(evt.target.equals(btNext)) { ((CardLayout)pCard.getLayout()).next(
pCard); } else if(evt.target.equals(btPrev)) { ((CardLayout)pCard.getLayout()).
previous(pCard); } else { return false; } return true; } return false; } }

Исходный текст документа HTML, созданный для аплета Options системой Java WorkShop, представлен в листинге 2.

Листинг 2. Файл Options.tmp.html

<applet
name="Options" code="Options" codebase= "file:/E:/Sun/Articles/vol8/src/Options"
width="500" height="600" align="Top" alt="If you had a java-enabled browser, you
would see an applet here."> <hr>If your browser recognized the applet
tag, you would see an applet here.<hr> </applet>