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The Java Applet Viewer

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Applet viewer is a command line program to run Java applets. It is included in the SDK. It helps you to test an applet before you run it in a browser. Before going any further, lets see what an applet is?

The Java Applet Viewer

     

Applet viewer is a command line program to run Java applets. It is included in the SDK. It helps you to test an applet before you run it in a browser. Before going any further, lets see what an applet is?

An applet is a special type of application that's included as a part of an HTML page and can be stored in a web page and run within a web browser. The applet's code gets transferred to the system and then the Java Virtual Machine (JVM) of the browser executes that code and displays the output.. So for running the applet,  the browser should be Java enabled.To create an applet, we need to define a class that inherits the Applet.

We generally use web browsers to run applets. Its not always mandatory to open a Web browser for running an applet. There is another way as well. The other way to run an applet is through Java applet viewer. This is a tool that acts as a test bed for Java applets. The working of Applet viewer is a bit different from a Web browser, though they are logically same. The Applet viewer runs on the HTML documentation, and uses embedded applet tags. The difference in using the applet viewer and the web browser to run the applet is that the applet viewer only deals with the applet code not the HTML cod i.e. it doesn't display HTML code. So we should test our program in applet viewer and web browser to confirm its working.

The applet viewer command connects to the documents or resources designated by urls. It displays each applet referenced by the documents in its own window.

The syntax for the applet viewer is:

appletviewer Options URL 

Where the URL specifies the location of the applet program and the Options argument specifies how to run the Java applet. We can use only one option -debug that starts the applet viewer in the Java debugger. Using this option we can debug an applet.

The following program shows how to build an applet and the HTML file for it. Firstly create a class. Then start the applet using init method. After that enter a string as str = "This is my first applet". Use paint method to give the dimensions of the applet. Beneath that is the HTML file which shows how to give the body for applet.

import java.applet.*;
import java.awt.*;
public class Myapplet extends Applet{
	String str;
	public void init(){
		str = "This is my first applet";
	}
	public void paint(Graphics g){
		g.drawString(str, 50,50);
	}
}

 

<HTML>
<BODY>
<applet code="Myapplet",height="200" width="200">
</applet>
</BODY>
</HTML>

After building the program, run the applet and the applet viewer as shown below.

C:\javac> javac Myapplet.java

C:\javac>appletviewer Myapplet.html

When we run the applet viewer it will display the window as shown below.


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Posted on: June 11, 2007

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