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<title>Java Class Library</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Java Class Library</span></span>

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<p>The <b>Java Class Library</b> (<b>JCL</b>) is a set of <a href="Library_(computer_science)" class="mw-redirect" title="Library (computer science)">dynamically loadable libraries</a> that <a href="List_of_JVM_languages" title="List of JVM languages">Java Virtual Machine (JVM) languages</a> can call at <a href="Run_time_(program_lifecycle_phase)" class="mw-redirect" title="Run time (program lifecycle phase)">run time</a>. Because the <a href="Java_Platform" class="mw-redirect" title="Java Platform">Java Platform</a> is not dependent on a specific <a href="Operating_system" title="Operating system">operating system</a>, applications cannot rely on any of the platform-native libraries. Instead, the Java Platform provides a comprehensive set of <a href="Standard_library" title="Standard library">standard class libraries</a>, containing the functions common to modern operating systems. Since Java 9, the Java Class Library can be accessed through module path using the <a href="Java_Platform_Module_System" title="Java Platform Module System">Java Platform Module System</a>.

</p><p>JCL serves three purposes within the JVM:

</p>

<ul><li>Like other <a href="Standard_library" title="Standard library">standard code libraries</a>, they provide the programmer a well-known set of useful facilities, such as <a href="Collection_class" class="mw-redirect" title="Collection class">container classes</a> and <a href="Regular_expression" title="Regular expression">regular expression</a> processing.</li>

<li>The library provides an abstract interface to tasks that would normally depend heavily on the hardware and operating system, such as <a href="Computer_networking" class="mw-redirect" title="Computer networking">network</a> access and <a href="Computer_file" title="Computer file">file</a> access.</li>

<li>Some underlying platforms may not support all of the features a Java application expects. In these cases, the library implementation can either emulate those features or provide a consistent way to check for the presence of a specific feature.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Implementation_and_configuration">Implementation and configuration</h2></div>

<p>JCL is almost entirely written in Java, except for the parts that need direct access to the <a href="Computer_hardware" title="Computer hardware">hardware</a> and <a href="Operating_system" title="Operating system">operating system</a> (such as for <a href="Input/output" title="Input/output">I/O</a> or <a href="Rasterisation" title="Rasterisation">bitmap graphics</a>), which are instead written in <a href="C%2B%2B" title="C++">C++</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The classes that give access to these functions commonly use <a href="Java_Native_Interface" title="Java Native Interface">Java Native Interface</a> wrappers to access operating system <a href="API" title="API">APIs</a>.

</p><p>Almost all of JCL is stored in a single <a href="JAR_(file_format)" title="JAR (file format)">Java archive</a> file called "rt.jar" which is provided with <a href="Java_Runtime_Environment" class="mw-redirect" title="Java Runtime Environment">JRE</a> and <a href="Java_Development_Kit" title="Java Development Kit">JDK</a> distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> and does not have to appear in the <a href="Classpath_(Java)" class="mw-redirect" title="Classpath (Java)">classpath</a> declared for the application. The <a href="Java_Runtime_Environment" class="mw-redirect" title="Java Runtime Environment">runtime</a> uses the bootstrap class loader to find the JCL.

</p><p>The <a href="Java_Module_System" class="mw-redirect" title="Java Module System">Java Module System</a> (part of the <a href="Java_9" class="mw-redirect" title="Java 9">Java 9</a> release) broke the monolithic "rt.jar" JAR file and modularized the JCL itself in several modules with specified dependencies.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Conformance">Conformance</h2></div>

<p>Any Java implementation must pass the Java <a href="Technology_Compatibility_Kit" title="Technology Compatibility Kit">Technology Compatibility Kit</a> tests for compliance, which includes JCL tests.

</p>

<div class="mw-heading mw-heading2"><h2 id="Main_features">Main features</h2></div>

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</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Java_Platform%2C_Standard_Edition" title="Java Platform, Standard Edition">Java Platform, Standard Edition</a></div>

<p>JCL Features are accessed through <a href="Class_(computer_science)" class="mw-redirect" title="Class (computer science)">classes</a> provided in <a href="Java_package" title="Java package">packages</a>.

</p>

<ul><li><code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/package-summary.html">java.lang</a></code> contains fundamental classes and <a href="Interface_(Java)" title="Interface (Java)">interfaces</a> closely tied to the language and <a href="Java_Runtime_Environment" class="mw-redirect" title="Java Runtime Environment">runtime system</a>.</li>

<li><a href="Input/output" title="Input/output">I/O</a> and <a href="Computer_networking" class="mw-redirect" title="Computer networking">networking</a> access the platform <a href="File_system" title="File system">file system</a>, and more generally <a href="Computer_network" title="Computer network">networks</a> through the <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/io/package-summary.html">java.io</a></code>, <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/nio/package-summary.html">java.nio</a></code> and <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/net/package-summary.html">java.net</a></code> packages. For networking, <a href="SCTP" class="mw-redirect" title="SCTP">SCTP</a> is available through <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/jdk.sctp/com/sun/nio/sctp/package-summary.html">com.sun.nio.sctp</a></code>.</li>

<li><a href="Java.math" class="mw-redirect" title="Java.math">Mathematics package</a>: <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/math/package-summary.html">java.math</a></code> provides mathematical expressions and evaluation, as well as arbitrary-precision decimal and integer number datatypes.</li>

<li><a href="Collection_class" class="mw-redirect" title="Collection class">Collections</a> and Utilities : built-in Collection <a href="Data_structure" title="Data structure">data structures</a>, and utility classes, for <a href="Regular_expression" title="Regular expression">regular expressions</a>, <a href="Concurrent_computing" title="Concurrent computing">concurrency</a>, <a href="Computer_data_logging" class="mw-redirect" title="Computer data logging">logging</a> and <a href="Data_compression" title="Data compression">data compression</a>.</li>

<li><a href="GUI" class="mw-redirect" title="GUI">GUI</a> and <a href="2D_computer_graphics" title="2D computer graphics">2D Graphics</a>: the <a href="Abstract_Window_Toolkit" title="Abstract Window Toolkit">AWT</a> package (<code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/java/awt/package-summary.html">java.awt</a></code>) basic GUI operations and binds to the underlying native system. It also contains the 2D Graphics API. The <a href="Swing_(java)" class="mw-redirect" title="Swing (java)">Swing</a> package (<code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/javax/swing/package-summary.html">javax.swing</a></code>) is built on AWT and provides a platform-independent <a href="Widget_toolkit" title="Widget toolkit">widget toolkit</a>, as well as a <a href="Pluggable_look_and_feel" title="Pluggable look and feel">pluggable look and feel</a>. It also deals with editable and non-editable text components.</li>

<li>Sound: interfaces and classes for reading, writing, <a href="Music_sequencer" title="Music sequencer">sequencing</a>, and <a href="Synthesizer" title="Synthesizer">synthesizing</a> of sound data.</li>

<li>Text: <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/text/package-summary.html">java.text</a></code> deals with text, dates, numbers and messages.</li>

<li>Image package: <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/java/awt/image/package-summary.html">java.awt.image</a></code> and <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/javax/imageio/package-summary.html">javax.imageio</a></code> provide APIs to write, read, and modify images.</li>

<li><a href="XML" title="XML">XML</a>: <a href="Simple_API_for_XML" title="Simple API for XML">SAX</a>, <a href="Document_Object_Model" title="Document Object Model">DOM</a>, <a href="StAX" title="StAX">StAX</a>, <a href="XSL_Transformations" class="mw-redirect" title="XSL Transformations">XSLT transforms</a>, <a href="XPath" title="XPath">XPath</a> and various APIs for <a href="Web_service" title="Web service">Web services</a>, as <a href="SOAP" title="SOAP">SOAP protocol</a> and <a href="Java_API_for_XML_Web_Services" class="mw-redirect" title="Java API for XML Web Services">JAX-WS</a>.</li>

<li>Security is provided by <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/security/package-summary.html">java.security</a></code> and encryption services are provided by <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/javax/crypto/package-summary.html">javax.crypto</a></code>.</li>

<li><a href="Database" title="Database">Databases</a>: access to <a href="SQL" title="SQL">SQL</a> databases via <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.sql/java/sql/package-summary.html">java.sql</a></code></li>

<li>Access to Scripting engines: The <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.scripting/javax/script/package-summary.html">javax.script</a></code> package gives access to any conforming <a href="Scripting_language" title="Scripting language">Scripting language</a>.</li>

<li><a href="Java_applet" title="Java applet">Applets</a>: <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/java/applet/package-summary.html">java.applet</a></code> allows applications to be downloaded over a network and run within a guarded sandbox</li>

<li><a href="JavaBean" class="mw-redirect" title="JavaBean">Java Beans</a>: <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.desktop/java/beans/package-summary.html">java.beans</a></code> provides ways to manipulate reusable components.</li>

<li>Introspection and reflection: <a rel="nofollow" class="external text" href="http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html">java.lang.Class</a> represents a class, but other classes such as Method and Constructor are available in <code><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/reflect/package-summary.html">java.lang.reflect</a></code>.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Licensing">Licensing</h2></div>

<div role="note" class="hatnote navigation-not-searchable">See also: <a href="Free_Java_implementations" title="Free Java implementations">Free Java implementations</a> and <a href="OpenJDK" title="OpenJDK">OpenJDK</a></div>

<div class="mw-heading mw-heading3"><h3 id="Prior_licenses">Prior licenses</h3></div>

<p>Before the release of OpenJDK, the <a href="Java_Development_Kit" title="Java Development Kit">JDK</a> was based on a <a href="Proprietary_software" title="Proprietary software">proprietary license</a>.

</p><p>Following their promise to release a fully buildable <a href="Java_Development_Kit" title="Java Development Kit">JDK</a> based on almost completely free and open-source code in the first half of 2007,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Sun released the complete <a href="Source_code" title="Source code">source code</a> of the Class Library under the <a href="GPL" class="mw-redirect" title="GPL">GPL</a> on May 8, 2007, except some limited parts that were licensed by Sun from third parties who did not want their code to be released under an open-source license.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Sun's goal was to replace the parts that remain proprietary and closed source with alternative implementations and make the Class Library completely free and open source.

</p><p>Until December 2010, the remaining encumbered part of the JDK was made available by <a href="Sun_Microsystems" title="Sun Microsystems">Sun</a> then <a href="Oracle_Corporation" title="Oracle Corporation">Oracle</a> as <i>Binary Plugs</i><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> which were required to build the JDK but not necessary to run it. as of May 2007, the only part of the Class library that remained proprietary and closed-source (4% as of May 2007 for OpenJDK 7,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and less than 1% as of May 2008 and OpenJDK 6<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>) was<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> the <a href="Simple_Network_Management_Protocol" title="Simple Network Management Protocol">SNMP</a> implementation.<sup id="cite_ref-openjdkb10_11-0" class="reference"><a href="#cite_note-openjdkb10-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p><p>Since the first May 2007 release, Sun, with the help of the community, released as open-source or replaced with open-source alternatives almost all the encumbered code:

</p>

<ul><li>All the audio engine code, including the <a href="Musical_Instrument_Digital_Interface" class="mw-redirect" title="Musical Instrument Digital Interface">software synthesizer</a>, became open source.<sup id="cite_ref-openjdkb10_11-1" class="reference"><a href="#cite_note-openjdkb10-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> The closed-source software synthesizer has been replaced by a new synthesizer developed specifically for OpenJDK called <i>Gervill</i>,<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></li>

<li>All <a href="Cryptography" title="Cryptography">cryptography</a> classes were released as open-source,<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li>

<li>The code that scales and <a href="Rasterisation" title="Rasterisation">rasterizes</a> <a href="Computer_font" title="Computer font">fonts</a> uses open source <a href="FreeType" title="FreeType">FreeType</a><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2dproject_16-0" class="reference"><a href="#cite_note-2dproject-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup></li>

<li>The native <a href="Color_management" title="Color management">color management</a> uses open-source <a href="LittleCMS" class="mw-redirect" title="LittleCMS">LittleCMS</a>.<sup id="cite_ref-2dproject_16-1" class="reference"><a href="#cite_note-2dproject-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> There is a pluggable layer in the JDK, so that the commercial release of Java can use the original, proprietary color management system and OpenJDK can use LittleCMS.</li>

<li>The <a href="Spatial_anti-aliasing" title="Spatial anti-aliasing">anti-aliasing</a> graphics <a href="Rasterisation" title="Rasterisation">rasterizer</a> code uses the open source Pisces renderer used in the <a href="PhoneME" title="PhoneME">phoneME</a> project.<sup id="cite_ref-2dproject_16-2" class="reference"><a href="#cite_note-2dproject-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li>

<li>The <a href="JavaScript" title="JavaScript">JavaScript</a> plugin is open source (the <a href="Rhino_(JavaScript_engine)" title="Rhino (JavaScript engine)">JavaScript engine</a> itself was open source from the beginning).<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup></li></ul>

<div class="mw-heading mw-heading3"><h3 id="Open_source_release">Open source release</h3></div>

<p>Beginning in December 2010, all the so-called <i>binary plugs</i> were replaced by <a href="Open-source_model" class="mw-redirect" title="Open-source model">open source</a> replacements, making the entire JDK open.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Alternative_implementations">Alternative implementations</h2></div>

<p><a href="GNU_Classpath" title="GNU Classpath">GNU Classpath</a> is the other main free software class library for Java. Contrary to other implementations, it only implements the Class Library, and is used by many <a href="Free_Java_implementations" title="Free Java implementations">free Java runtimes</a> (like <a href="Kaffe" title="Kaffe">Kaffe</a>, <a href="SableVM" title="SableVM">SableVM</a>, <a href="JamVM" title="JamVM">JamVM</a>).

</p><p><a href="Apache_Harmony" title="Apache Harmony">Apache Harmony</a> was another free software class library. Its aim was to implement the other parts of the Java stack (<a href="Java_virtual_machine" title="Java virtual machine">Virtual Machine</a>, <a href="Java_compiler" title="Java compiler">Compiler</a>, and other tools required for any <a href="Free_Java_implementations" title="Free Java implementations">Java implementation</a>).

</p>

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<ul><li><a href="Java_Platform%2C_Standard_Edition" title="Java Platform, Standard Edition">Java Platform, Standard Edition</a></li>

<li><a href="OpenJDK" title="OpenJDK">OpenJDK</a></li>

<li><a href="Free_Java_implementations" title="Free Java implementations">Free Java implementations</a></li>

<li><a href="Standard_library" title="Standard library">Standard library</a></li>

<li><a href="Java_applet" title="Java applet">Java applet</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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<li id="cite_note-openjdkb10-11"><span class="mw-cite-backlink">^ <a href="#cite_ref-openjdkb10_11-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-openjdkb10_11-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://mail.openjdk.java.net/pipermail/jdk6-dev/2008-May/000058.html">"OpenJDK 6 b10 source posted"</a>. 2008-05-30. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090618054843/http://mail.openjdk.java.net/pipermail/jdk6-dev/2008-May/000058.html">Archived</a> from the original on 2009-06-18<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-06-01</span></span>.</cite></span>

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<li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://openjdk.java.net/projects/font-scaler/">"font-scaler projectpage"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150610021721/http://openjdk.java.net/projects/font-scaler/">Archived</a> from the original on 2015-06-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2007-05-19</span></span>.</cite></span>

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<li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html">"Freetype font rasteriser"</a>. 2007-08-07. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090107195849/http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html">Archived</a> from the original on 2009-01-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2007-11-24</span></span>.</cite></span>

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<li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85">"Javascript is encumbered and there is no javascript plugin support"</a>. <a href="IcedTea" title="IcedTea">IcedTea</a>. 2008-03-11. Archived from <a rel="nofollow" class="external text" href="http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85">the original</a> on 2008-09-27<span class="reference-accessdate">. Retrieved <span class="nowrap">2008-06-01</span></span>. <q><i>Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.</i></q></cite></span>

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<li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><cite id="CITEREFKelly_O'Hair2010" class="citation web cs1">Kelly O'Hair (December 2010). <a rel="nofollow" class="external text" href="http://mail.openjdk.java.net/pipermail/build-dev/2010-December/003881.html">"OpenJDK7 and OpenJDK6 Binary Plugs Logic Removed"</a>. <a href="Oracle_Corporation" title="Oracle Corporation">Oracle Corporation</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220407115622/http://mail.openjdk.java.net/pipermail/build-dev/2010-December/003881.html">Archived</a> from the original on 2022-04-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-11-25</span></span>.</cite></span>

</li>

</ol></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<li><a rel="nofollow" class="external text" href="https://docs.oracle.com/en/java/javase/24/docs/api/">Java SE 24 API Javadocs</a></li>

<li><a rel="nofollow" class="external text" href="http://java.sun.com/reference/api/index.html">Java SE API documentation</a></li>

<li>Java software development kits (status as of August 2006):

<ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20070610111552/https://jdk7.dev.java.net/">1.7</a> (early development)</li>

<li><a rel="nofollow" class="external text" href="http://java.sun.com/javase/6/">1.6</a> (stable, current)</li>

<li><a rel="nofollow" class="external text" href="http://java.sun.com/j2se/1.5.0/">1.5</a> (stable)</li>

<li><a rel="nofollow" class="external text" href="http://java.sun.com/j2se/1.4.2/">1.4</a> (stable)</li>

<li><a rel="nofollow" class="external text" href="http://java.sun.com/j2se/1.3/">1.3</a> (obsolete)</li></ul></li></ul>

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</style><div id="Java_(software_platform)419" style="font-size:114%;margin:0 4em"><a href="Java_(software_platform)" title="Java (software platform)">Java (software platform)</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Platforms</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Java_Platform%2C_Micro_Edition" title="Java Platform, Micro Edition">Java ME</a> (Micro)</li>

<li><a href="Java_Platform%2C_Standard_Edition" title="Java Platform, Standard Edition">Java SE</a> (Standard)</li>

<li><a href="Jakarta_EE" title="Jakarta EE">Jakarta EE</a> (Enterprise)</li>

<li><a href="Android_software_development#SDK" title="Android software development">Android SDK</a></li>

<li><a href="GraalVM" title="GraalVM">GraalVM</a></li></ul>

</div></td><td class="noviewer navbox-image" rowspan="5" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technologies</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Oracle</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Squawk_virtual_machine" title="Squawk virtual machine">Squawk</a></li>

<li><a href="Java_Development_Kit" title="Java Development Kit">Java Development Kit</a></li>

<li><a href="OpenJDK" title="OpenJDK">OpenJDK</a></li>

<li><a href="Java_virtual_machine" title="Java virtual machine">Java virtual machine</a></li>

<li><a href="JavaFX" title="JavaFX">JavaFX</a></li>

<li><a href="Maxine_Virtual_Machine" title="Maxine Virtual Machine">Maxine VM</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Platform</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Java_applet" title="Java applet">Applets</a></li>

<li><a href="Jakarta_Servlet" title="Jakarta Servlet">Servlets</a></li>

<li><a href="MIDlet" title="MIDlet">MIDlets</a></li>

<li><a href="Java_Web_Start" title="Java Web Start">Web Start</a> (JNLP)</li>

<li><a href="Java_Platform_Module_System" title="Java Platform Module System">Modules</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Major<br>third-party</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Blackdown_Java" title="Blackdown Java">Blackdown</a></li>

<li><a href="Eclipse_(software)" title="Eclipse (software)">Eclipse</a></li>

<li><a href="GNU_Classpath" title="GNU Classpath">GNU Classpath</a></li>

<li><a href="Apache_Harmony" title="Apache Harmony">Harmony</a></li>

<li><a href="Hibernate_(framework)" title="Hibernate (framework)">Hibernate</a></li>

<li><a href="IcedTea" title="IcedTea">IcedTea</a></li>

<li><a href="Jazelle" title="Jazelle">Jazelle</a></li>

<li><a href="Spring_Framework" title="Spring Framework">Spring</a></li>

<li><a href="Apache_Struts" title="Apache Struts">Struts</a></li>

<li><a href="Oracle_TopLink" title="Oracle TopLink">TopLink</a></li>

<li><a href="WildFly" title="WildFly">WildFly</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">History</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Java_version_history" title="Java version history">Java version history</a></li>

<li><a href="Java_Community_Process" title="Java Community Process">Java Community Process</a></li>

<li><a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a></li>

<li><a href="Free_Java_implementations" title="Free Java implementations">Free Java implementations</a></li>

<li>Slogan: <i><a href="Write_once%2C_run_anywhere" title="Write once, run anywhere">Write once, run anywhere</a></i></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_JVM_languages" title="List of JVM languages">JVM<br>languages</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="BeanShell" title="BeanShell">BeanShell</a></li>

<li><a href="Clojure" title="Clojure">Clojure</a></li>

<li><a href="Groovy_(programming_language)" class="mw-redirect" title="Groovy (programming language)">Groovy</a></li>

<li><a href="JRuby" title="JRuby">JRuby</a></li>

<li><a href="Jython" title="Jython">Jython</a></li>

<li><a href="Kotlin_(programming_language)" title="Kotlin (programming language)">Kotlin</a></li>

<li><a href="Processing" title="Processing">Processing</a></li>

<li><a href="Rhino_(JavaScript_engine)" title="Rhino (JavaScript engine)">Rhino</a></li>

<li><a href="Scala_(programming_language)" title="Scala (programming language)">Scala</a></li>

<li><a href="Oxygene_(programming_language)" title="Oxygene (programming language)">Oxygene</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Community</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Conferences</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="JavaOne" title="JavaOne">JavaOne</a></li>

<li><a href="Devoxx" title="Devoxx">Devoxx</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organizations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Apache_Software_Foundation" class="mw-redirect" title="Apache Software Foundation">Apache Software Foundation</a></li>

<li><a href="Eclipse_Foundation" title="Eclipse Foundation">Eclipse Foundation</a></li>

<li><a href="Java_Community_Process" title="Java Community Process">Java Community Process</a></li>

<li><a href="Oracle_Corporation" title="Oracle Corporation">Oracle Corporation</a></li>

<li><a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a>, <a href="Sun_Microsystems_Laboratories" class="mw-redirect" title="Sun Microsystems Laboratories">Sun Microsystems Laboratories</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="James_Gosling" title="James Gosling">James Gosling</a></li>

<li><a href="Arthur_van_Hoff" title="Arthur van Hoff">Arthur van Hoff</a></li>

<li><a href="Urs_H%C3%B6lzle" title="Urs Hölzle">Urs Hölzle</a></li>

<li>Patrick Naughton</li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b> • <span class="nowrap"><span class="skin-invert-image noviewer" typeof="mw:File"></span> </span><a href="Portal%3AComputer_programming" title="Portal:Computer programming">Computer programming portal</a></div></td></tr></tbody></table></div>

<div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Sun_Microsystems214" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><div id="Sun_Microsystems214" style="font-size:114%;margin:0 4em"><a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div><a href="Acquisition_of_Sun_Microsystems_by_Oracle_Corporation" title="Acquisition of Sun Microsystems by Oracle Corporation">Acquired by Oracle</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hardware</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Systems</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="SPARCstation" title="SPARCstation">SPARCstation</a>–server–center

<li><a href="SPARCclassic" title="SPARCclassic">classic</a></li>

<li><a href="Sun_Netra" title="Sun Netra">Netra</a></li>

<li><a href="Sun_Ultra" title="Sun Ultra">Ultra</a>

<li><a href="Sun_Enterprise" title="Sun Enterprise">Enterprise</a>

<li><a href="Sun_Blade" title="Sun Blade">Blade server</a></li>

<li><a href="Sun_Blade_(workstation)" title="Sun Blade (workstation)">Blade workstation</a></li>

<li><a href="SPARC_Enterprise" title="SPARC Enterprise">SPARC Enterprise</a></li>

<li><a href="JavaStation" title="JavaStation">JavaStation</a></li>

<li><a href="Sun_Java_Workstation" title="Sun Java Workstation">Java Workstation</a></li>

<li><a href="Cobalt_Qube" title="Cobalt Qube">Cobalt Qube</a></li>

<li><a href="Cobalt_RaQ" title="Cobalt RaQ">Cobalt RaQ</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Processors</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="SPARC" title="SPARC">SPARC</a></li>

<li><a href="MicroSPARC" title="MicroSPARC">microSPARC</a></li>

<li><a href="SuperSPARC" title="SuperSPARC">SuperSPARC</a></li>

<li><a href="UltraSPARC" title="UltraSPARC">UltraSPARC</a></li>

<li><a href="UltraSPARC_II" title="UltraSPARC II">UltraSPARC II</a>

<ul><li>UltraSPARC IIe</li>

<li>UltraSPARC IIi</li>

<li>Gemini</li></ul></li>

<li><a href="UltraSPARC_III" title="UltraSPARC III">UltraSPARC III</a>

<ul><li>UltraSPARC III Cu</li>

<li>UltraSPARC IIIi</li></ul></li>

<li><a href="UltraSPARC_IV" title="UltraSPARC IV">UltraSPARC IV</a></li>

<li><a href="UltraSPARC_T1" title="UltraSPARC T1">UltraSPARC T1</a></li>

<li><a href="UltraSPARC_T2" title="UltraSPARC T2">UltraSPARC T2</a></li>

<li><a href="SPARC_T3" title="SPARC T3">SPARC T3</a></li>

<li><a href="SPARC_T4" title="SPARC T4">SPARC T4</a></li>

<li><a href="SPARC_T5" title="SPARC T5">SPARC T5</a></li>

</div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Fireplane" title="Fireplane">Fireplane</a></li>

<li><a href="Sun_Modular_Datacenter" title="Sun Modular Datacenter">Modular Datacenter</a></li>

<li><a href="Sun_Neptune" title="Sun Neptune">Neptune</a></li>

<li><a href="System_Service_Processor" title="System Service Processor">System Service Processor</a></li>

<li><a href="SPARC_T_series" title="SPARC T series">SPARC T series</a></li>

<li><a href="Ultra_Port_Architecture" title="Ultra Port Architecture">Ultra Port Architecture</a></li>

<li><a href="Visual_Instruction_Set" title="Visual Instruction Set">Visual Instruction Set</a></li></ul>

</div></td></tr></tbody></table><div></div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Software</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="SunOS" title="SunOS">SunOS</a></li>

<li><a href="Oracle_Solaris" title="Oracle Solaris">Solaris</a></li>

<li><a href="SunView" title="SunView">SunView</a></li>

<li><a href="OpenWindows" title="OpenWindows">OpenWindows</a></li>

<li><a href="Java_Desktop_System" title="Java Desktop System">Java Desktop System</a></li>

<li><a href="Oracle_Developer_Studio" title="Oracle Developer Studio">Studio</a></li>

<li><a href="StarOffice" title="StarOffice">StarOffice</a></li>

<li><a href="IPlanet" title="IPlanet">iPlanet</a></li>

<li><a href="Sun_Java_System" title="Sun Java System">Java System</a></li>

<li><a href="Oracle_Secure_Global_Desktop" title="Oracle Secure Global Desktop">Sun Secure Global Desktop</a></li>

<li><a href="MySQL" title="MySQL">MySQL</a></li>

<li><a href="GlassFish" title="GlassFish">GlassFish</a></li>

<li><a href="VirtualBox" title="VirtualBox">VirtualBox</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Storage</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Sun_StorageTek_5800_System" title="Sun StorageTek 5800 System">StorageTek 5800 System</a></li>

<li><a href="StorageTek_SL8500" title="StorageTek SL8500">StorageTek SL8500</a></li>

<li><a href="Sun_Open_Storage" title="Sun Open Storage">Open Storage</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Performance</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Sun_Cloud" title="Sun Cloud">Cloud</a></li>

<li><a href="Sun_Constellation_System" title="Sun Constellation System">Constellation System</a></li>

<li><a href="Sun_Visualization_System" title="Sun Visualization System">Visualization System</a></li>

<li><a href="Oracle_Grid_Engine" title="Oracle Grid Engine">Grid Engine</a></li>

<li><a href="Lustre_(file_system)" title="Lustre (file system)">Lustre</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Research</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Oracle_Labs" title="Oracle Labs">Sun Microsystems Laboratories</a></li>

<li><a href="PicoJava" title="PicoJava">picoJava</a></li>

<li><a href="Fortress_(programming_language)" title="Fortress (programming language)">Fortress</a></li>

<li><a href="Project_Looking_Glass" title="Project Looking Glass">Project Looking Glass</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Education</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="BlueJ" title="BlueJ">BlueJ</a></li>

<li><a href="Curriki" title="Curriki">Global Education & Learning Community</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Acquisitions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Afara_Websystems" title="Afara Websystems">Afara Websystems</a></li>

<li><a href="Cobalt_Networks" title="Cobalt Networks">Cobalt Networks</a></li>

<li><a href="Gridware" class="mw-redirect" title="Gridware">Gridware</a></li>

<li><a href="Lighthouse_Design" title="Lighthouse Design">Lighthouse Design</a></li>

<li><a href="Montalvo_Systems" title="Montalvo Systems">Montalvo Systems</a></li>

<li><a href="MySQL_AB" title="MySQL AB">MySQL AB</a></li>

<li><a href="Procom_Technology" title="Procom Technology">Procom Technology</a></li>

<li><a href="SavaJe" title="SavaJe">SavaJe</a></li>

<li><a href="StorageTek" title="StorageTek">StorageTek</a></li>

<li><a href="Tarantella%2C_Inc." title="Tarantella, Inc.">Tarantella</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Slogans</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="The_Network_is_the_Computer" title="The Network is the Computer">The Network is the Computer</a></li>

<li><a href="Write_once%2C_run_anywhere" title="Write once, run anywhere">Write once, run anywhere</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Community</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Common_Development_and_Distribution_License" title="Common Development and Distribution License">Common Development and Distribution License</a></li>

<li><a href="Java_Community_Process" title="Java Community Process">Java Community Process</a></li>

<li><a href="NetBeans" title="NetBeans">NetBeans</a></li>

<li><a href="OpenOffice.org" title="OpenOffice.org">OpenOffice.org</a></li>

<li><a href="OpenSolaris" title="OpenSolaris">OpenSolaris</a></li>

<li><a href="OpenSPARC" title="OpenSPARC">OpenSPARC</a></li>

<li><a href="OpenJDK" title="OpenJDK">OpenJDK</a></li>

<li><a href="Open_Source_University_Meetup" title="Open Source University Meetup">Open Source University Meetup</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="List_of_Sun_Microsystems_employees" title="List of Sun Microsystems employees">People</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Andy_Bechtolsheim" title="Andy Bechtolsheim">Andy Bechtolsheim</a></li>

<li><a href="Scott_McNealy" title="Scott McNealy">Scott McNealy</a></li>

<li><a href="Vinod_Khosla" title="Vinod Khosla">Vinod Khosla</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div>Category</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-08-04" href="https://en.wikipedia.org/wiki/?title=Java_Class_Library&oldid=1304201924">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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