Applet
Applet is an application running on web browser.
it is designed to be transmitted over the internet and running always on client
machine.
Web Architecture
Applet are small
application that are accessed on a Internet server, transported over the Internet,
automatically installed & run as part of web document.
Hierarchy of Applet
Applet
Life Cycle
init() :this is for initialization
as like constructor ,it is automatically called by system itself.
start() : this methods
automatically calls when java calls init method
stop() : this method
automatically calls when user moves off the page on which the applet sits.
destroy() : Java is
guaranted to call this method when the browser shuts down normally.
paint(Graphics g) : The paint( ) method
is called each time your applet’s output must be redrawn.
Simple
Applet Program
Follow the steps for
applet program
1. Write
the Simple program
import java.awt.*;
import java.applet.*;
class MyApplet extends
Applet
{
public void
paint (Graphics g)
{
g.drawString ("Hello World", 25, 50);
}
}
2. Save
this program as MyApplet.java,
3. Compile
Applet program by using command javac MyApplet.java
4. After
that do the HTML code as like below
<html>
<head>This is Applet Program</head>
<body>
<applet
code="MyApplet" width=200 height=60>
</applet>
</body>
</html>
5. Save this html code as Applet.html.and open it into web browser.See output.
Restriction of Applet
- Applet can never run any local executable program.
- Applet can’t communicate with an internet site other than the one that served the web page that included the applet.
- Applet can’t read/write files on user’s file system.
- All windows popped by an applet carry a warning message.
- Applet can never find any info about the local computer.
If any problem persist
use comment line to share your problem.
