Portal:Java

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The Java Portal

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Duke (Java mascot) waving.svg
Welcome to Wikipedia's Java portal. Java refers to a number of computer software products and specifications from Sun Microsystems that together provide a system for developing application software and deploying it in a cross-platform environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to enterprise servers and supercomputers. Java is nearly ubiquitous in mobile phones, Web servers and enterprise applications, and while less common on desktop computers, Java applets are often used to provide improved functionality while browsing the World Wide Web. Code is produced through writing in the Java programming language, then executed by a Java Virtual Machine (JVM). In 2006, Sun Microsystems made the bulk of its implementation of Java available under a public license.


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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.

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Here is a typical photo of Sun Tech Days Java events, this one held in Spain.

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Vinod Khosla
Vinod Khosla, Web 2.0 Conference.jpg
Born (1955-01-28) January 28, 1955 (age 62)
Pune, India
Occupation Venture capitalist
Net worth Increase$1.5 billion
Spouse(s) Neeru
Children Nina, Anu, Vani and Neal

Vinod Khosla (born January 28, 1955 in Pune, India is an Indian-American venture capitalist. He is an influential personality in Silicon Valley. He was one of the co-founders of Sun Microsystems and became first CEO & Chairman of Sun Microsystems and then became a general partner of the venture capital firm Kleiner, Perkins, Caufield & Byers in 1986. In 2004 Khosla formed his own firm, Khosla Ventures.

Sun Microsystems

After graduating from Stanford University in 1980, Khosla along with his Stanford fellows Scott McNealy, Andy Bechtolsheim, and a UC Berkeley masters degree holder named Bill Joy founded Sun Microsystems. He became first CEO and Chairman of Sun Microsystems from 1982 to 1984. Khosla left Sun in 1985. He then joined the venture capital firm Kleiner Perkins Caufield & Byers in 1986 as a general partner. Khosla is also one of the founders of TiE, The Indus Entrepreneurs, and has guest-edited a special issue of Economic Times (ET), a leading business newspaper in India.

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Did you know...


  • ... that Java SE 6 is code-named Mustang?
  • ... that Duke is Java's mascot and "smart agent" assisting the user in PDA?

Quiz

1. Who said: "There's only one trick in software, and that is using a piece of software that's already been written."?

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2. When was Java first released?

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3. Why is JavaScript thus named if it is essentially unrelated to Java?

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4. Which was Java's original name: Green, Oak, Stealth, C++ ++ --, firstperson, Duke or Coffee?

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5. True or False: An Interface can never be private or protected?

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  • 1997: Java 1.1
  • 1998: Java 1.2
  • 2000: Java 1.3
  • 2002: Java 1.4
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