Portal:Java
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JavaBean
JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool. Practically, they are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is a Java Object that is serializable, has a nullary constructor, and allows access to properties using getter and setter methods.
JavaBean conventions
In order to function as a JavaBean class, an object class must obey certain conventions about method naming, construction, and behavior. These conventions make it possible to have tools that can use, reuse, replace, and connect JavaBeans.
The required conventions are:
- The class must have a public default constructor. This allows easy instantiation within editing and activation frameworks.
- The class properties must be accessible using get, set, and other methods (accessor methods and mutator methods), following a standard naming convention. This allows easy automated inspection and updating of bean state within frameworks, many of which include custom editors for various types of properties.
- The class should be serializable. This allows applications and frameworks to reliably save, store, and restore the bean's state in a fashion that is independent of the VM and platform.
Because these requirements are largely expressed as conventions rather than by implementing interfaces, some developers view JavaBeans as Plain Old Java Objects that follow specific naming conventions.
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?
- Answer (External link)
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News
Hi everybody! We just opened the WikiProject Java (and portal) . So enjoy!
Java: (bot)
Science:
- January 20: Wikinews Shorts: January 20, 2012
- January 18: Meteorites in Morocco found to be from Mars
- January 16: Russian spacecraft Phobos-Grunt falls in Pacific Ocean
- January 1: On the campaign trail, December 2011
- December 8: What's eating you? US study highlights bedbug incest
- December 8: 'There's been another murder': UK's Wright Stuff presenter apologises for teen murder comments
- November 25: Scientists sequence small genome of a pest: spider mite
- October 1: 'Fascinating' and 'provocative' research examines genetic elements of bipolar, schizophrenia
- September 27: Study: Birds learn nest building
- September 10: Out of space in outer space: Special report on NASA's 'space junk' plans
Selected sound
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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Selected quote
| “ | Within C++, there is a much smaller and cleaner language struggling to get out. And no, that smaller and cleaner language is not Java or C#... | ” |
Index of Java articles
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