ITFT- Applet in java

Apr 25, 20146 likes1,791 views

introduction to Applets, life cycle of applets, methods of applets, examples,embedding apllets in html files, compiling and running of applets with appletviewer

2
Introduction
We can write two kinds of program in JAVA
they are
APPLICATION BASED
APPLET BASED
The application based programs are the
programs which are used in the places such
as super markets, hospitals etc.
The applet based program is used for the
development of Graphics .

APPLETS
APPLET is a small application
embedded in HTML page, which is
accessed & transported over the
Internet , automatically installed
into client machines and run as
part of web page.
Applet are great for creating
dynamic & interactive web
applications .
Applet is a self executing program .

Init() : initializes applet before loading.
Start(): starts execution of applet
Paint(): graphics created
Stop(): stops any operation
Destroy(): applet completes execution
To create applet , Applet class from java. applet
package should be imported so tht they are
automatically run by any applet program
Applet Life Cycle

The init() method
 The init method is invoked after the
applet is created or recreated.
 A subclass of Applet should
overrides this method if the subclass
has an initialization to perform.
 Usually includes creating new
thread, loading images, setting up
GUI components

Start() method
 The start method is invoked after the init
method.
 Called whenever the applet become active
 A subclass of Applet overrides this method
if it has any operation that needs to be
performed whenever the webpage is
visited.
 An applet with animation might use the start
method to resume animation

Stop() method
 The stop method is the opposite of the start
method.
 Is invoked when the user leave the page.
 A subclass of Applet overrides this method
if it has any operation that needs to be
performed
 When the user leaves the page, any
threads that applet has started but not
completed will continue to run. You should
override the stop method to suspend the
running threads so that the applet does not
take up system resources when it is
inactive

Destroy() method
 The destroy() method is invoked when the
browser exits normally to inform the applet
that is no longer needed and should release
any resources it has allocated.
 The stop method is always called before the
destroy method
 A subclass of Applet overrides this method if
it has any operation that needs to be
performed before it is destroyed
 Usually you won’t need to override this
method unless you wish to release specific
resources, such as threads that the applet
created

A SIMPLE APPLET
import java.applet.*;
import java.awt.*;
public class MyApplet extends Applet
{
public void paint (Graphics g)
{
g.drawString ("Hi this is my first Applet
program", 25, 50);
}
}

11
Adding applet to Html File
• You can only run an applet in an HTML page
• The HTML looks something like this:
• <html>
<body>
<h1>Myapplet Applet</h1>
<applet code=“Myapplet.class"
width="250" height="200">
</applet>
</body>
</html>

Running Applet in
AppletViewer
• Compiling
javac Myapplet.java
• Running
appletviewer Myapplet.java
Applet viewer is a command line program to run Java
applets.

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ITFT- Applet in java

1. APPLET PROGRAMMING

2. 2 Introduction We can write two kinds of program in JAVA they are APPLICATION BASED APPLET BASED The application based programs are the programs which are used in the places such as super markets, hospitals etc. The applet based program is used for the development of Graphics .

3. APPLETS APPLET is a small application embedded in HTML page, which is accessed & transported over the Internet , automatically installed into client machines and run as part of web page. Applet are great for creating dynamic & interactive web applications . Applet is a self executing program .

4. Init() : initializes applet before loading. Start(): starts execution of applet Paint(): graphics created Stop(): stops any operation Destroy(): applet completes execution To create applet , Applet class from java. applet package should be imported so tht they are automatically run by any applet program Applet Life Cycle

6. The init() method  The init method is invoked after the applet is created or recreated.  A subclass of Applet should overrides this method if the subclass has an initialization to perform.  Usually includes creating new thread, loading images, setting up GUI components

7. Start() method  The start method is invoked after the init method.  Called whenever the applet become active  A subclass of Applet overrides this method if it has any operation that needs to be performed whenever the webpage is visited.  An applet with animation might use the start method to resume animation

8. Stop() method  The stop method is the opposite of the start method.  Is invoked when the user leave the page.  A subclass of Applet overrides this method if it has any operation that needs to be performed  When the user leaves the page, any threads that applet has started but not completed will continue to run. You should override the stop method to suspend the running threads so that the applet does not take up system resources when it is inactive

9. Destroy() method  The destroy() method is invoked when the browser exits normally to inform the applet that is no longer needed and should release any resources it has allocated.  The stop method is always called before the destroy method  A subclass of Applet overrides this method if it has any operation that needs to be performed before it is destroyed  Usually you won’t need to override this method unless you wish to release specific resources, such as threads that the applet created

10. A SIMPLE APPLET import java.applet.*; import java.awt.*; public class MyApplet extends Applet { public void paint (Graphics g) { g.drawString ("Hi this is my first Applet program", 25, 50); } }

11. 11 Adding applet to Html File • You can only run an applet in an HTML page • The HTML looks something like this: • <html> <body> <h1>Myapplet Applet</h1> <applet code=“Myapplet.class" width="250" height="200"> </applet> </body> </html>

12. Running Applet in AppletViewer • Compiling javac Myapplet.java • Running appletviewer Myapplet.java Applet viewer is a command line program to run Java applets.

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