Portal:Java
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Java applet
A Java applet is an applet delivered to the users in the form of Java bytecode. Java applets can run in a Web browser using a Java Virtual Machine (JVM), or in Sun's AppletViewer, a stand-alone tool for testing applets. Java applets were introduced in the first version of the Java language in 1995. Java applets are usually written in the Java programming language but they can also be written in other languages that compile to Java bytecode such as Jython, Ruby or Eiffel.
Applets are used to provide interactive features to web applications that cannot be provided by HTML alone. They can capture mouse input (like rotating 3D object) and also have controls like buttons or check boxes. In response to the user action an applet can change the provided graphic content. This makes applets well suitable for demonstration, visualization and teaching purposes. For instance, a complete suite for ordinary differential equations course has been written. An applet can also be text area only, providing, for instance, cross platform command-line interface to some remote system. If needed, applet can leave the dedicated area and run as separate window. However applets have very little control on web page content outside the applet dedicated area, so they are less useful for improving the site appearance in general (while applets like news tickers or WYSIWYG editors are also known). Applet can also play media in formats that are not natively supported by the browser.
Java applets run at a speed that is comparable to (but generally slower than) other compiled languages such as C++, but many times faster than JavaScript. In addition they can use 3D hardware acceleration that is available from Java. This makes applets well suitable for non trivial, computation intensive visualizations.
HTML page may embed parameters that are passed to the applet. Hence the same applet may appear differently depending on that parameters were passed. First implementations were downloading an applet class by class. While classes are small files, there are frequently a lot of them, so applets got a reputation of slow loading components. However since jars were introduced an applet is usually delivered as a single file that has a size of the bigger image (hundreds of kilobytes to several megabytes).
Since Java's bytecode is platform independent, Java applets can be executed by browsers for many platforms, including Windows, Unix, Mac OS and Linux. It is also trivial to run Java applet as an application with very little extra code. This has the advantage of running a Java applet in offline mode without the need for internet browser software and also directly from the development IDE.
Many Java developers, blogs and magazines are recommending that the Java Web Start technology be used in place of Applets.
A Java Servlet is sometimes informally compared to be "like" a server-side applet, but it is different in its language, functions, and in each of the characteristics described here about applets.
Java is the most used application of eLearning for engineering education because of its high value of visualization.
Selected picture
Here is a photo of Sand Hill Road along which Java began as Green.
Selected biography
| William Nelson Joy | |
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| Born | November 8, 1954 |
| Residence |  United States |
| Alma mater | University of Michigan, University of California, Berkeley |
| Occupation | Computer Scientist |
| Known for | Co-founder of Sun Microsystems vi NFS csh "Why the future doesn't need us" |
William Nelson Joy (born November 8, 1954), commonly known as Bill Joy, is an American computer scientist. Joy co-founded Sun Microsystems in 1982 along with Vinod Khosla, Scott McNealy, Andy Bechtolsheim and Vaughan Pratt, and served as chief scientist at the company until 2003. He is widely known for having written the essay "Why the future doesn't need us", where he expresses deep concerns over the development of modern technologies. He has two children, Hayden and Maddie.
Sun
According to a Salon.com article, during the early 1980s DARPA had contracted the company Bolt, Beranek and Newman (BBN) to add TCP/IP to Berkeley UNIX. Joy had been instructed to plug BBN's stack into Berkeley Unix, but he refused to do so, as he had a low opinion of BBN's TCP/IP. So, Joy wrote his own high-performance TCP/IP stack. According to John Gage,
"BBN had a big contract to implement TCP/IP, but their stuff didn't work, and Joy's grad student stuff worked. So they had this big meeting and this grad student in a T-shirt shows up, and they said, 'How did you do this?' And Bill said, 'It's very simple — you read the protocol and write the code.'"
Rob Gurwitz, who was working at BBN at the time, disputes this version of events.
In 1986, Joy was awarded a Grace Murray Hopper Award by the ACM for his work on the Berkeley UNIX Operating System.
Joy was also a primary figure in the development of the SPARC microprocessors, the Java programming language, Jini / JavaSpaces and JXTA.
On September 9, 2003 Sun announced that Bill Joy was leaving the company and that he "is taking time to consider his next move and has no definite plans".
Did you know...
- ... that both the Mozilla Firefox and Microsoft Internet Explorer browser designs are descended from the Mosaic web browser?
- ... that Netscape was the first web browser to support Java, other than Java's own HotJava Browser?
- ... that Java SE 6 is code-named Mustang?
- ... that Java Runtime Environment is found on over 700 million PCs?
- ... that in 2008 Hewlett-Packard created a prototype of the theoretical fourth and last passive circuit element, the memristor (first devised in 1971), that may one day revolutionize electronics?
Quiz
1. Who said: "There's only one trick in software, and that is using a piece of software that's already been written."?
2. When was Java first released?
3. Why is JavaScript thus named if it is essentially unrelated to Java?
4. Which was Java's original name: Green, Oak, Stealth, C++ ++ --, firstperson, Duke or Coffee?
5. True or False: An Interface can never be private or protected?
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(These articles are the ones recently identified as possibly Java-related but yet unconfirmed) This list was generated from these rules (ruleset version). Questions and feedback are always welcome! The search is being run manually, but eventually will run ~daily with the most recent ~7 days of results.
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- November 25: Scientists sequence small genome of a pest: spider mite
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Created to imitate a buzzer into a microphone and then taking a 0.05 second clip and repeating it over and over with Java so it actually sounds like a buzzer.
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| “ | The way that big software companies used to make software was hiring all the smart people, locking them in a room, and sliding pizza under the door, until they had written whatever needed writing. And then selling tickets to get into the room. | ” |
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