Java applet

Small application written in Java / From Wikipedia, the free encyclopedia

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Java applets were small applications written in the Java programming language, or another programming language that compiles to Java bytecode, and delivered to users in the form of Java bytecode. The user launched the Java applet from a web page, and the applet was then executed within a Java virtual machine (JVM) in a process separate from the web browser itself. A Java applet could appear in a frame of the web page, a new application window, Sun's AppletViewer, or a stand-alone tool for testing applets.

Java_applet.png
A Java applet that was created as supplementary demonstration material for a scientific publication
OpenAstexViewer.jpg
A Java applet that uses 3D hardware acceleration to visualize 3D files in .pdb format downloaded from a server[1]
Cardiac_cells_applet.png
Using applet for nontrivial animation illustrating biophysical topic (randomly moving ions pass through voltage gates)[2]
Mandelbrot_java_applet.png
Using a Java applet for computation – intensive visualization of the Mandelbrot set[3]
ChessApplet.png
Applets' running speed is sufficient for making e.g. nontrivial computer games that play chess.[4]
NASA_World_Wind.jpg
NASA World Wind (open source) is a second generation applet[5] that makes heavy use of OpenGL and on-demand data downloading to provide a detailed 3D map of the world.
Remoteconsoleapplet.png
Web access to the server console at the hardware level with the help of a Java applet
FFT2DApplet.png
Demonstration of image processing using two dimensional Fourier transform

Java applets were introduced in the first version of the Java language, which was released in 1995. Beginning in 2013, major web browsers began to phase out support for the underlying technology applets used to run, with applets becoming completely unable to be run by 2015–2017. Java applets were deprecated by Java 9 in 2017.[6][7][8][9][10]

Java applets were usually written in Java, but other languages such as Jython, JRuby, Pascal,[11] Scala, NetRexx, or Eiffel (via SmartEiffel) could be used as well.

Java applets run at very fast speeds[citation needed] and until 2011, they were many times faster than JavaScript.[citation needed] Unlike JavaScript, Java applets had access to 3D hardware acceleration, making them well-suited for non-trivial, computation-intensive visualizations. As browsers have gained support for hardware-accelerated graphics thanks to the canvas technology (or specifically WebGL in the case of 3D graphics),[12][13] as well as just-in-time compiled JavaScript,[14] the speed difference has become less noticeable.[citation needed]

Since Java bytecode is cross-platform (or platform independent), Java applets could be executed by clients for many platforms, including Microsoft Windows, FreeBSD, Unix, macOS and Linux. They could not be run on mobile devices, which do not support running standard Oracle JVM bytecode. Android devices can run code written in Java compiled for the Android Runtime.