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Programming Language (JAVA)

Unit 6.11 Applets

Presentation2

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Objectives

At the end of this presentation, you will be able to :

Write an applet program to print a text usingapplet class and its methods

View an applet using a Web browser

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Applet State Transition

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Hands-On!

ProgramHelloJava.java prints the stringhelloin the applet window, which is contained

in the browser window.

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The Applet Class

All the applets that are created should besubclasses of the Applet class.

Applet programs should import two packages,awt and applet.

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Class Inheritance of Applet Clas

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Execution of Applet

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Applet Viewer

Appletviewer is a standard JDK tool used torun an applet program as a standalone

application.

A comment statement, containing the applettag, is added to the java file.

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Hands-On!

Program Welcome.java prints a string in anapplet window using appletviewer.

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tag

Syntax/*

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Activity 6.11.1

Step 1: Open the file applet_view.java.

Step 2: Add the given comment at the end of

the file.

/*

*/

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Activity 6.11.1 (Contd..)

Step 3:Save the program.

Step 4:Compile the program.

Step 5:Run and observe the output byexecuting the program using applet vieweras

appletviewer applet_view.java

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Executing Applets Through HTML

Applets can also be viewed using a Webbrowser.

Steps to view an applet in a Web browser.

Step 1: Compile the java file.

Step 2: Include the applet tag in an HTML file.

Step 3: Open the HTML file in a Web browser.

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Web Page Template

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Sample Applet

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Hands-On!

Program add.javacalculates the sum of two

numbers and prints it in the applet window.

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Activity 6.11.2

Step 1: OpenA_11_2.java from Student data file.

Step 2: Compile the above program.

Step 3: Edit the code line 7 aspublic classFirstApplet.

Step 4: Edit the code line 11 as Welcome, 150,50.

Step 5: Save the program as FirstApplet.java.

Step 6: Compile the Java program and save the.class file in the same directory.

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Step 7:Type the following HTML code and save itas a.html.

1. 2.

3.

4.

5.

6.

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Step 8: Replace the textA_11_2.class in line 3

with FirstApplet.class.

Step 9: Save the program.

Step 10: Run the HTML file in the browserwindow and observe the applet window.

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Lab Exercise

1. Write an applet program to print your friendsname as a string and display the applet

window through the browser and appletviewer.

2. Writean applet program to print the differencebetween two numbers and display the appletwindow through browser.

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Summary

In this presentation, you learnt the following

Applets created are subclasses of Appletclass.

All applets must importjava.appletpackage.Applet class is contained in thejava.appletpackage.

The Applet class provides the necessary supportfor applets.

All applets should also importjava.awtpackage.

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