Re: When writing applet do you start out as an application or applet?

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 12 May 2008 08:45:02 -0700

Message-ID:

<482865fe$0$1569$b9f67a60@news.newsdemon.com>

jmDesktop wrote:

If you are creating an application that is going to be run in an
applet, do you start out creating a regular application an moving it
to an applet or just creating it as an applet, beginning to end. Size
of project is moderat to large. Thanks.

It depends on a lot of things. If my program is only going to be an
Applet, I create it as an Applet. Often if my program can be contained
in a Panel or drawn on a Canvas, I extend that component and can either
add it to an Applet or an application. See the simple example below of
test.java which extends Canvas and draws a blue oval in a yellow
background. The test1.java is an Applet and will display the test
class. test2.java is an application and will also display the test class.

import java.awt.*;

public class test extends Canvas {
     public void paint(Graphics g) {
         int w = getWidth();
         int h = getHeight();
         g.setColor(Color.YELLOW);
         g.fillRect(0,0,w,h);
         g.setColor(Color.BLUE);
         g.fillOval(w/4,h/4,w/2,h/2);
     }
}

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

public class test1 extends Applet {
     public void init() {
         test t = new test();
         t.setPreferredSize(new Dimension(400,300));
         add(t);
     }
}

<html>
     <head>
     </head>
     <body>
         <applet code="test1.class" width="640" height="480">
         </applet>
     </body>
</html>

import java.awt.*;
import java.awt.event.*;

public class test2 {
     public static void main(String[] args) {
         final Frame f = new Frame("test2");
         f.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 f.dispose();
             }
         });

         test t = new test();
         t.setPreferredSize(new Dimension(400,300));

         f.add(t,BorderLayout.CENTER);
         f.pack();
         f.setVisible(true);
     }
}

Sometimes you can make a hybrid that is both an Applet and an
application. The following code can be run as an Applet or as an
application. The Applet is a handy component, it extends Container and
Panel and can be used for anything that those components can be used for.

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

public class test3 extends Applet {
     public void paint(Graphics g) {
         int w = getWidth();
         int h = getHeight();
         g.setColor(Color.BLUE);
         g.fillRect(0,0,w,h);
         g.setColor(Color.YELLOW);
         g.fillOval(w/4,h/4,w/2,h/2);
     }

     public static void main(String[] args) {
         final Frame f = new Frame("test3");
         f.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 f.dispose();
             }
         });

         test3 t3 = new test3();
         t3.setPreferredSize(new Dimension(400,300));
         f.add(t3,BorderLayout.CENTER);
         f.pack();
         f.setVisible(true);
     }
}

--

Knute Johnson
email s/nospam/linux/

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