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Java es un lenguaje de programación multiplataforma. de Sun Microsystems que, que permite desarrollar y ejecutar aplicaciones que puedan correr en diferentes plataformas. Java es también ampliamente usado en la parte del servidor en la web como servlests, y también como applets para aplicaciones de escritorio complejas (aunque en este área tiene reputación de ser algo lento).

La plataforma Java consiste en la máquina virtual de Java y de implementaciones de las librerías estándar. Con el fin de tener en cuenta distintos sistemas y necesidades existen tres versiones de la plataforma. Sun llama a estas implementaciones de la plataforma Java, JRE (Java Runtime Environment o Entorno en tiempo de ejecución de Java).

Java Links
  • JGuru
  • JavaSoft
  • Sun Java JSP & XML
  • Java Free Course
  • Java Boutique
  • Code Project
  • DevX
  • Developer.com
    Java Recursos en linea y Tutoriales
  • Java Tutorial from Sun Microsistems
  • servlets and JSP Training
  • general Java Training Courses
  • Servlet/JSP Books:
  • Core Web Programming
  • Core Servlets
    -
  • More Servlets
  • Java Books
  • Java FAQs and Tutorials
  • Java Documentation
  • Java Programming Courses
  • Downloading Compilers and Browsers
  • Development Environments (IDEs) ; Editors
  • Core Servlets and ; JSP Code Archive
  • Core Web Programming Code Archive
  • Java Resources at Sun
  • Examples
  • Free Java Tools
  • Other Java Programming Pages
  • JSP and Servlets
  • Applet and Class Library Collections
  • Java Security
  • HTML and JavaScript
  • Java Programming Books
  • Java Programming FAQs and Tutorials
  • Beginner and advanced Frequently Asked Questions lists. General Java tutorials and tutorials on specific Java programming topics.
  • Java Programming Documentation
  • The core Java APIs (Java 1.02, 1.1, and Java 1.2), specialized APIs (Java3D, PersonalJava, etc.), the official Java language spec, and documentation on Sun Java programming tools (java, javac, javadoc, etc).
  • Java Programming Courses
  • Public or on-site Java short courses taught by an experienced Java developer, well-known Java book author, and award-winning instructor.
  • Downloading Java compilers, Java-enabled browsers, and other standard Java packages.
  • JDK 1.02/1.1/1.2, browsers, JRE, Swing, Java plugin, etc. Includes links to IBM's high-performance Java engine for Java 1.1.7 and Sun's HotSpot performance engine for Java 1.2. Free versions for most operating systems.
  • Java Programming Examples
  • Pen widths for drawing operations, image buttons, network programming, CGI programming in Java, exec, etc. Java source code available for unrestricted use.
  • Java Applet and Class Library Collections
  • General collections of applets or reusable Java classes, including graphics/graphing applets and classes, and Java games.
  • Core Servlets and ; JavaServer Pages Source Code Archive
  • Hundreds of fully documented servlets, JSP pages, and related Java utilities. From bestselling Sun Microsystems Press book.
  • Core Web Programming Source Code Archive
  • Hundreds of fully documented Java examples, including Swing, Java 2D, threads, events, XML, servlets, and JSP. Also lots of HTML 4, CSS, and JavaScript examples.
  • Java Programming Resources at Sun
  • General Java resources, official API and language specifications (Java 1.0-2.0), non-core Java packages (Java3D, servlets, EJB, etc), etc.
  • Integrated Development Environments and Editors for Java
  • Commercial and free IDE's for developing Java applets, desktop applications in Java, and server-side Java. Also Java programming editors for Windows, Unix, and MacOS.
  • Free Java Programming Tools
  • Free Java development, debugging, decompiling, and graphics toolkits.
  • Other Java Programming Resource Pages
  • Some of the more extensive Java collections, plus online searches of tech news sources for articles about Java.
  • JSP and Servlets
  • Servlet and JSP specifications, documentation, servers (engines), IDEs, books, training courses, Web hosting providers, and more.
  • Java Security
  • Sites discussing current/recent packages for programming security using Java APIs. Also papers on mostly-old Java security problems.
  • General WWW Programming Resources
  • HTML tutorials, specifications, editors, and validators. CGI and HTTP references. JavaScript documentation. Browser stats. Etc.
  • K -- Java Developer's Kit (Free)
  • Java for Solaris (SPARC and x86)
  • Java for Windows.
    • Sun's JDK
    • JDK 1.1.7 from IBM. As of 4/99, this supposedly outperformed both the Sun and the Microsoft 1.1 JVM's by 20% on most benchmarks. Uses similar technology to Sun's HotSpot, but is for Java 1.1, whereas HotSpot is for Java 1.2/1.3 (aka Java 2).
  • Java for MacOS
  • Linux
  • Netscape Navigator/Communicator (Mozilla).
    Version 6 supports JDK 1.3. Version 4.06 and later supports JDK 1.1.
  • Microsoft Internet Explorer.
    Supports JDK 1.1.
  • HotJava from Sun.
    Supports JDK 1.1.
  • Swing 1.03.
  • Swing 1.1.
  • Java Runtime Environment (JRE) for Windows 95/98/NT and Solaris. This lets you run Java but not compile it (javac), generate documentation (javadoc), etc. A smaller footprint for delivery-only platforms.
  • Java Plugin (formerly "Activator"). Lets you install Sun's Java VM in Netscape or IE, but you can't use the standard APPLET tag (and thus your code won't run on systems without the plugin). You can have Java 1.1 in Netscape and IE version three, or even have Java 1.2.
  • Java Servlets. An efficient, flexible, and portable alternative to CGI. (Also see the Apache Tomcat usage page).
  • JavaServer Pages (JSP) Portable, powerful alternative to ASP or ColdFusion. (Also see the Apache Tomcat usage page).
  • Java IDL.
  • Java3D.
    Example Java Applets and href="http://www.corewebprogramming.com/">Core Web Programming; all are freely available for unrestricted use.
  • A Debugging Web Server. This separate page gives an HTTP server in Java that echos back all headers sent to it. Useful when doing CGI programming, for debugging FORMs and verifying headers sent by browsers and other clients.
  • Images as Components Please note that these Java classes work around AWT programming limitations in Java 1.02 and 1.1. With Swing, much better programming options are available. For that, please see my tutorial on Swing programming. ImageLabel.java A Java class that creates a Component containing an image. Like the Label class, it can get positioned by the layout manager and will get repainted automatically.
  • ImageLabelTest.html
  • ImageLabel.html
  • ImageButton.java
  • A Java button class use Swing and JButton.) ImageButtons.html ImageButton.html Icon.java A Java class built on ImageLabel that supports drag and drop for ImageLabels. I.e. draggable pictures/icons. IconTest.html Icon.html
  • GraphicsUtil. A Java class that adds pen width arguments to the drawing methods of java.awt.Graphics. Also creates drawCircle and fillCircle methods, adds optional Color arguments to each of the drawing methods, and adds an optional Font argument to drawString and drawChars. Documentation is at GraphicsUtil.html, and the Java source is at GraphicsUtil.java. A simple on-line demo can be viewed at GraphicsUtilDemo.html.
  • CGI Programming in Java
    This separate page summarizes the use of Java for CGI programming: how to use Java applets to talk to CGI programs via either GET or POST, and how to write CGI programs in Java. Includes on-line examples, a CGI form parser in Java, and an HTTP cookie value parser in Java.
  • Accessing Java from JavaScript. This separate page summarizes the ways to call Java from JavaScript in Netscape 3 and 4. These programming approaches also generally work in the Windows version of IE4.
  • Accessing JavaScript from Java. This separate page summarizes the ways to call JavaScript from Java in Netscape 3 and 4. These programming approaches also generally work in the Windows version of IE4.
  • Slider. A horizontal slider combining a Scrollbar and a TextField. You can drag the scrollbar or type into the TextField; either way, both stay in sync. Works the same on both Java 1.0 and 1.1, despite differences in how Scrollbar interprets the max value in the two cases. Also tries to work around some Windows 95/NT Scrollbar bugs. The source code is available in Slider.java, with documentation at Slider.html. For an on-line example, see SliderApplet.html.
  • Mouse and Keyboard Event Reporter An applet that reports all mouse and keyboard events in a textfield. An on-line demo is at Events.html, with source code at Events.java (which uses EventPanel.java).
  • Whiteboard A very simple whiteboard that illustrates Java 1.1 event handling by letting you type text and draw freehand. An on-line demo is at Whiteboard2.html, with Java source at Whiteboard2.java (which uses SimpleWhiteboard2.java). Java 1.02 version is available at Whiteboard.html, with Java source at Whiteboard.java (which uses SimpleWhiteboard.java).
  • Java 1.1 Key Listeners A demonstration of Java 1.1 event-handling; two text areas where you can type into either and get the same result in both. An on-line demo (Java 1.1 browsers only) is at Mirror.html, with source code at Mirror.java.
  • Java 1.1 Inner Classes and Mouse Events A simple demo of inner classes to handle mouse events in Java 1.1 (click to draw circles). An on-line demo (Java 1.1 browsers only) is at Circles.html, with source code at Circles.java.
  • Lightweight Components in Java 1.1 A demonstration of the fact that lightweight components in Java 1.1 can be transparent. An on-line demo (Java 1.1 browsers only) is at BetterCircleTest2.html (compare to the opaque heavyweight components at CircleTest2.html). Source code is at BetterCircleTest2.java (which uses BetterCircle.java). Source for the heavyweight version is at CircleTest2.java (which uses Circle.java).
  • Lightweight Containers in Java 1.1 A demonstration of the fact that lightweight containers in Java 1.1 can be transparent. An on-line demo (Java 1.1 browsers only) is at LightPanel.html (compare to the opaque heavyweight panel at HeavyPanel.html). Source code is at LightPanel.java (source for the opaque heavyweight panel is at HeavyPanel.java).
  • Frames that Can Be Closed Java Frames that actually (gasp) close when the user instructs them to. I use these as the starting points for all my graphical applications.
  • ScrollPanes in Java 1.1 A simple example of a ScrollPane: ScrollPaneTest.java. Built on CloseableFrame.java.
  • Creating Menus in Frames An illustration of pulldown menus: ColorMenu.java. Built on QuittableFrame.java.
  • Serializing Windows in Java 1.1 Creates a Frame that you can stretch, move around, and add circles to by clicking the mouse. If you save it to disk, then running the application in a later session automatically restores it to previous configuration. Source is at SavedFrame.java, which uses CirclePanel.java and is built on CloseableFrame.java.
  • Rolling Your Own Popup Menus in Java 1.02 A way to create tolerable (but not great) popup menus in Java 1.02 by extending Window. Really intended for applications, since most browsers do not let you discover the absolute location of the mouse. However, the on-line demo works on appletviewer, and works somewhat on other browsers if the window is near the upper-left corner of the screen. Source code is at ColorPopupTest.java, which uses ColorPopup.java, and Popup.java.
  • Using FileDialog An example that uses a FileDialog to select a file name, then loads the contents of the file into a TextArea. Source is at DisplayFile.java, and is built on QuittableFrame.java.
  • Network Programming Note that there are PostScript reference sheets which provide explanation that these examples illustrate.
  • ShowHTML. A Netscape3-specific way of generating HTML on-the-fly or reading it from a stream and sending it to the browser. Defines showPage(applet, htmlString) and showPage(applet, htmlString, frameName) methods. Source is available at http://www.apl.jhu.edu/~hall/java/CGI/ShowHTML.java, and a test page that illustrates it is at .../TestHTML.html.
  • Exec. A class that simplifies executing remote commands from Java applications. Source code is at Exec.java, with documentation at Exec.html.
  • JavaStub. An application that simplifies prototyping of applets by generating stub files for you. Given a partial filename like HelloWorld, it generates a mostly blank but working class HelloWorld.java which can be run as either an applet or an application. It also generates HelloWorld.html with an APPLET statement that loads HelloWorld.class. Documentation is at http://www.apl.jhu.edu/~hall/java/JavaStub.html, and the code is at .../JavaStub.java and .../JavaStub.class.
  • NQueens. Solves the N-Queens problem for N from 4 to 60 in linear time (constant time per queen). The N-Queens problem involves placing N tokens (chess queens) on an NxN grid such that none share a row, column, or diagonal. On an 8x8 grid this amounts to placing 8 queens on a chess board such that none threaten each other. Although this problem is commonly used to illustrate search techniques, there is a common misconception that search is required to find a solution (although search is required to find all solutions). Algorithm adapted from ACM SIGART Bulletin. Run it by loading http://www.apl.jhu.edu/~hall/java/NQueens.html. The source code is at .../NQueens.java.
  • TrackerUtil. A small class that uses MediaTracker to let you use a single method call to load one or more images, waiting until they are done loading before continuing. Documentation is at TrackerUtil.html, and the code is at TrackerUtil.java.
    • Collections
  • Source code archive for Core Web Programming 250+ Java classes and 200+ HTML/JavaScript documents presented in the book.
  • Developer.com's Java index, the mega applet collection. Formerly called "Gamelan".
  • JARS -- Java Applet Rating Service. Collection of applets judged "Top X%" (for various X).
  • The J Files -- Java Centre's applet collection.
  • Acme Java Software. Applets and class libraries from Jef Poskanzer. Includes a printf-like formatting library.
  • JavaShareware.com
  • Java Class Warehouse. Class library collection from James Tauber.
  • SGI's applet collection.
  • Digital Cats' Java Collection. Available in English or Japanese.
  • Yahoo's applet collection.
  • Applets from German Java Repository.
  • The Java Boutique. From Jason Gurney and MecklerMedia.
  • Jerry's Java Page. From Jerry Haygood.
  • Lava Rocks; printf, DES, and other utilities.
  • Graphics Applets and Class Libraries
  • Developer.com's collection of Java charting and graphing classes.
  • Mica, a free 2D graphics library for Java.
  • Perspective for Java. Charting/graphing tools from 3D Graphics Co.
  • JavaChart, another free chart/graph package. From Visual Engineering.
  • Jim Buzbee's Hershey Font class.
    • Java Games
  • Games at Developer.com (Gamelan).
  • Games from the JavaBoutique.
  • "Rated" games from the Java Applet Rating Service.
  • Cool Applets and Games. From Mark Boynes.
  • Java Programming Resources at SunThis is in addition to the API (1.0, 1.1, and 1.2), compiler/browser (JDK/HotJava) and development environment (Java Workshop) available from the Java documentation, downloading, and IDE sections, respectively.
  • Sun's main Java homepage. Available in HTML version or Java version.
  • Sun's Java FAQ's. Collection of Frequently Asked Questions on various Java-related topics.
  • JavaSoft's top-level documentation page.
  • Index of Sun's Java-related products and API's.
  • The JavaOne Conferences.
  • Java Solutions Guide. Index to 3rd-party commercial Java applications.
  • Java application success stories.
  • The Java Community Process. How to be involved in the Java specification development.
  • Sun vs. Microsoft Java lawsuit. Information from Sun about the lawsuit against Microsoft over Java compatibility. For more objective coverage, see Yahoo's coverage of the lawsuit or search online news sources for recent articles about the lawsuit.
  • Articles about the AOL/Netscape/Sun deal.
  • Sun's Java training courses (US). (If Sun's courses seem a bit steep, or you want something on-site, or prefer an instructor with more hands-on Java development experience, also see these courses.)
  • Java Foundation Classes (Swing).
  • JDBC.
  • JavaBeans.
  • Java Servlets.
  • Java WebServer.
  • Enterprise JavaBeans.
  • Java IDL.
  • Java 3D.
  • JavaSpaces.
  • Java Blend database integration package.
  • Sun's HTML Display Component.
  • Free Java Programming Tools
  • JGL, the Java Generic Library. Data structures and algorithms for Java: stacks, queues, sorting, searching, sets, etc. Licensed by Microsoft and Borland, but can be downloaded and used for free.
  • Jikes Debugger. A graphical debugger for Java from IBM.
  • Performance Profilers
  • Components from ORO Inc. Regular expressions; packages for FTP, NNTP, SMTP, etc; AWK-like tools; etc.
  • WebMacro Servlet Toolkit. From Justin Wells et al.
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