how to exicute applets in java

I. Applets

Start a MS-DOS command window.
For PCs running Windows NT (as in the Weber Lab),
choose Start/Programs/Command Prompt from the Windows NT desktop.
For PCs running Windows 95,
choose Start/Shut Down/Restart in MS-DOS Mode from the Windows 95 desktop.
Now, change to the directory of your choice from within the command window.
For example:
>cd \Temp
Create some Java source code with Notepad from within the command window.
For example, suppose we want a class named "A",
then we would start Notepad with the name of the Java file:
>notepad A.java
The source code, A.java, might look like this:
// This program draws a tall rectangle via the A.html applet tag.
// mlc
// 9/1999
import java.applet.*;
import java.awt.*;
public class A extends Applet{
private int w, h;
public void init( )
{w = 45;h = 50;
}
public void paint(Graphics g)
{
g.drawRect(w, h, 20, 80);
}
}
Don't forget to save the file!
Double check the name of the Java program file you just saved
by listing out the files in the current directory:
>dir /p
If the name of the Java program file listed does not end in .java,
you need to rename it so that it does
For instance, if the file appears as A.java.txt, type
>ren A.java.txt A.java
Now if you list the files in the directory, you should see it named correctly
Now, since this is an applet, we'll need to make an HTML file.
We could call it A.html and create it from the command line using Notepad again:
>notepad A.html
The A.html file might look like this:


This file launches the 'A' applet: A.class!



Again, be sure to save the file
Also be sure that the name of the file ends in .html (not .txt)
Assuming we saved the Java source code (as in step 4) from within Notepad,
we can now go back to the command prompt and compile it.
This is done with the javac compiler command:
>javac A.java
If everything compiles fine
(we know this by the fact we had no error messages and the "A.class" file exists),
we are ready to run it.
Otherwise, we have to go back to Notepad and edit the A.java
until there are no more mistakes.
Then we repeat step 7 after saving the changes.
At this point (assuming we saved the HTML file in step 5),
we can run either a Java-enabled browser or simply use the appletviewer program from the command line:
>appletviewer A.html
The above command should bring up a window using the HTML file and then launch (or run) the Java applet from within the viewer.
This file launches the 'A' applet: A.class!
You should see a tall rectangle. Good work!
Refference:
http://www.developer.com/open/article.php/791151/Java-Applet-Basics.htm
http://www.cs.colostate.edu/helpdocs/JavaInDOS.html