java applet

• Java applet

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Java applet - Technical information

1 Java applets are executed in a sandbox by most web browsers,

preventing them from accessing local data like clipboard or file system. The

code of the applet is downloaded from a web server and the browser

either embeds the applet into a web page or opens a new window

showing the applet's user interface.



1 A Java applet extends the class java.applet.Applet, or in the case of a Swing applet, javax.swing.JApplet. The class must override methods from the applet class to

set up a user interface inside itself (Applet) is a descendant of Panel which is a

descendant of Container. As applet inherits from container, it has largely the same user

interface possibilities as an ordinary Java application, including regions with user

specific visualization.


Java applet - Example

1 The following example is made simple enough to illustrate the

essential use of Java applets through its java.applet package. It also uses

classes from the Java Abstract Window Toolkit (AWT) for producing

actual output (in this case, the "Hello, world!" message).


Java applet - Disadvantages

1 Some browsers, notably mobile browsers running Apple iOS or Android do not run Java

applets at all.


Java applet

1 Java applets were introduced in the first version of the Java language in 1995.


Java applet

1 They are usually written in Java (programming language)|Java but other languages such as

Jython,[http://www.jython.org/archive/21/applets/index.html Jython applet page] JRuby,

[http://michal.hantl.cz/ruby-in-browser-jruby-inside-an-applet/ About Java applets in Ruby] Scala (programming language)|Scala or Eiffel

(programming language)|Eiffel (via SmartEiffel)[http://eiffelzone.com/esd/wrapj/ A tool to produce Java applets with SmartEiffel]

may be used as well.


Java applet

1 Until approximately 2011, Java applets had been many times faster

than JavaScript.[http://www.timestretch.co

m/FractalBenchmark.html An example of the 2005 year

performance benchmarking] Unlike JavaScript, Java applets have access to 3D hardware acceleration, making

them well suited for non-trivial, computation intensive visualizations


Java applet

1 Since Java's bytecode is cross-platform (or platform independent), Java applets can be executed by browsers (or other client (computing)|clients) for many platforms, including Microsoft Windows, FreeBSD, Unix, OS X and Linux. It is also trivial to

run a Java applet as an application software with very little extra code so that it can be run directly from the integrated

development environment (IDE).



1 Java applets are executed in a sandbox (security)|sandbox by most/all web

browsers, preventing them from accessing local data like clipboard

(software)|clipboard or file system. The code of the applet is downloaded from a

web server and the browser either compound document|embeds the applet into a web page or opens a new window

showing the applet's user interface.



1 A Java applet extends the class , or in the case of a Swing (Java)|Swing applet, . The class must override methods from

the applet class to set up a user interface inside itself (Applet) is a descendant of

which is a descendant of . As applet inherits from container, it has largely the

same user interface possibilities as an ordinary Java application, including

regions with user specific visualization.


Java applet - Embedding into a web page

1 Deprecating applet tag has been criticized.[

http://mindprod.com/jgloss/applet.html#OBJECT Criticism] of APPLET tag deprecation Oracle now provides a

maintained JavaScript code[ http://www.java.com/java/deployJava.txt Java applet launcher from Oracle - Link Broken!] to launch applets with

cross platform workarounds.https://store.theartofservice.com/the-java-applet-toolkit.html

Java applet - Example

1 Simple applets are shared freely on the internet for customizing

applications that support plugin (computing)|plugins.For example,

see [http://en.wikiversity.org/wiki/Java_ap

plets Java applet section in Wikiversity]


Java applet - Advantages

1 A Java applet can have any or all of the following advantages:[

http://download.oracle.com/javase/tutorial/deployment/applet/index.html

Oracle official] overview on Java applet technology


Java applet - Disadvantages

1 *Some browsers, notably mobile browsers running iOS (Apple)|Apple iOS or Android (Operating System)|Android do not run Java applets at

all.[ http://www.java.com/en/download/fa

q/java_mobile.xml]


Java applet - Unsigned

1 Communities may solve this problem via Code review|source code review or

running applets on a dedicated domain.[http://strategy.wikimedia.org/wiki/Propos

al:Java_applet_support Strategy.Wikimedia.org], proposal with

discussion about Java applets in community sites[http://Ultrastudio.org

Ultrastudio.org], user editable educational site with full applet support


Java applet - Alternatives

1 Of these, JavaScript is not always viewed as a competing replacement; JavaScript can coexist

with applets in the same page, assist in launching applets (for instance, in a separate frame or providing platform workarounds) and

later be called from the applet code.[ http://www.rgagnon.com/javadetails/java-

0170.html Rgagnon.com], calling a Java applet from JavaScript JavaFX is an extension of the Java platform and may also be viewed as an

alternative.


Comet (programming) - Early Java applets

1 The ability to embed Java applets into browsers (starting with Netscape 2.0 in March 1996http://web.archive.org/web/1996111520

3505/www27.netscape.com/comprod/products/navigator/version_2.0/index.html Netscape.com from 1996 (via Archive.org)) made real-time communications possible,

using a raw Transmission Control Protocol|TCP sockethttp://java.sun.com/j2se/1.4.2/docs/api/

java/net/Socket.html to communicate between the browser and the server


Applet - Java Applet

1 Since Java's bytecode is platform-independent, Java applets can be

executed by browsers running under many platforms, including Microsoft Windows|Windows, Unix, Mac OS,

and Linux


Applet - Java Applets

1 A Java applet contains different security models:

Java_applet#Unsigned|unsigned Java applet security, Java_applet#Signed|

signed Java applet security, and Java_applet#Self_signed|self signed

Java applet security.


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