Java Class Library - Revision history

129.97.124.58: /* Implementation and configuration */

2025-04-01T18:56:16Z

Implementation and configuration

← Previous revision		Revision as of 18:56, 1 April 2025
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	==Implementation and configuration==		==Implementation and configuration==
	JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]), which are instead written in [[C++]]. The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.		JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]), which are instead written in [[C++]].<ref>{{cite web\|url=https://github.com/openjdk/jdk\|title=Based on the OpenJDK sources\|access-date=23 October 2021\|publisher=[[OpenJDK]]}}</ref> The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.

	Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05 \| archive-date=2009-04-25 \| archive-url=https://web.archive.org/web/20090425152829/http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| url-status=live }}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.		Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05 \| archive-date=2009-04-25 \| archive-url=https://web.archive.org/web/20090425152829/http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| url-status=live }}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.

129.97.124.58: /* Implementation and configuration */

2025-04-01T18:55:14Z

Implementation and configuration

← Previous revision		Revision as of 18:55, 1 April 2025
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	==Implementation and configuration==		==Implementation and configuration==
	JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]). The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.		JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]), which are instead written in [[C++]]. The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.

	Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05 \| archive-date=2009-04-25 \| archive-url=https://web.archive.org/web/20090425152829/http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| url-status=live }}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.		Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05 \| archive-date=2009-04-25 \| archive-url=https://web.archive.org/web/20090425152829/http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| url-status=live }}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.

LemurianPatriot: Added short description

2025-02-24T22:39:34Z

Added short description

← Previous revision		Revision as of 22:39, 24 February 2025
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			{{Short description\|Core Java libraries}}
	{{more citations needed\|date=August 2011}}		{{more citations needed\|date=August 2011}}
	The '''Java Class Library''' ('''JCL''') is a set of [[Library (computer science)#Dynamic linking\|dynamically loadable libraries]] that [[List of JVM languages\|Java Virtual Machine (JVM) languages]] can call at [[Run time (program lifecycle phase)\|run time]]. Because the [[Java Platform]] is not dependent on a specific [[operating system]], applications cannot rely on any of the platform-native libraries. Instead, the Java Platform provides a comprehensive set of [[Standard library\|standard class libraries]], containing the functions common to modern operating systems.		The '''Java Class Library''' ('''JCL''') is a set of [[Library (computer science)#Dynamic linking\|dynamically loadable libraries]] that [[List of JVM languages\|Java Virtual Machine (JVM) languages]] can call at [[Run time (program lifecycle phase)\|run time]]. Because the [[Java Platform]] is not dependent on a specific [[operating system]], applications cannot rely on any of the platform-native libraries. Instead, the Java Platform provides a comprehensive set of [[Standard library\|standard class libraries]], containing the functions common to modern operating systems.

Lfstevens: ref cleanup

2024-08-08T01:48:20Z

ref cleanup

← Previous revision		Revision as of 01:48, 8 August 2024
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	* The code that scales and [[Rasterisation\|rasterizes]] [[Computer font\|fonts]] uses open source [[FreeType]]<ref>{{Cite web \|url=http://openjdk.java.net/projects/font-scaler/ \|title=font-scaler projectpage \|access-date=2007-05-19 \|archive-date=2015-06-10 \|archive-url=https://web.archive.org/web/20150610021721/http://openjdk.java.net/projects/font-scaler/ \|url-status=live }}</ref><ref name="2dproject">{{Cite web \|url=http://openjdk.java.net/groups/2d/ \|title=Java2D project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132229/http://openjdk.java.net/groups/2d/ \|url-status=live }}</ref><ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|title=Freetype font rasteriser \|date=2007-08-07 \|accessdate=2007-11-24 \|archive-date=2009-01-07 \|archive-url=https://web.archive.org/web/20090107195849/http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|url-status=live }}</ref>		* The code that scales and [[Rasterisation\|rasterizes]] [[Computer font\|fonts]] uses open source [[FreeType]]<ref>{{Cite web \|url=http://openjdk.java.net/projects/font-scaler/ \|title=font-scaler projectpage \|access-date=2007-05-19 \|archive-date=2015-06-10 \|archive-url=https://web.archive.org/web/20150610021721/http://openjdk.java.net/projects/font-scaler/ \|url-status=live }}</ref><ref name="2dproject">{{Cite web \|url=http://openjdk.java.net/groups/2d/ \|title=Java2D project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132229/http://openjdk.java.net/groups/2d/ \|url-status=live }}</ref><ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|title=Freetype font rasteriser \|date=2007-08-07 \|accessdate=2007-11-24 \|archive-date=2009-01-07 \|archive-url=https://web.archive.org/web/20090107195849/http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|url-status=live }}</ref>
	* The native [[color management]] uses open-source [[LittleCMS]].<ref name="2dproject" /> 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.		* The native [[color management]] uses open-source [[LittleCMS]].<ref name="2dproject" /> 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.
	* The [[Spatial anti-aliasing\|anti-aliasing]] graphics [[Rasterisation\|rasterizer]] code uses the open source Pisces renderer used in the [[phoneME]] project.<ref name="2dproject" /><ref>[https://phoneme.dev.java.net/ phoneme.dev.java.net/] ~~{{webarchive~~\|url=https://web.archive.org/web/20070610234355/https://phoneme.dev.java.net/ \|date=2007-06-10}}</ref><ref>{{Cite web \|url=http://openjdk.java.net/projects/graphics-rasterizer/ \|title=graphics-rasterizer project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132602/http://openjdk.java.net/projects/graphics-rasterizer/ \|url-status=live }}</ref>		* The [[Spatial anti-aliasing\|anti-aliasing]] graphics [[Rasterisation\|rasterizer]] code uses the open source Pisces renderer used in the [[phoneME]] project.<ref name="2dproject" /><ref>{{cite web\|url=https://phoneme.dev.java.net/ phoneme.dev.java.net/ \|title=Welcome to the PhoneME project \|archive-url=https://web.archive.org/web/20070610234355/https://phoneme.dev.java.net/ \|archive-date=2007-06-10}}</ref><ref>{{Cite web \|url=http://openjdk.java.net/projects/graphics-rasterizer/ \|title=graphics-rasterizer project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132602/http://openjdk.java.net/projects/graphics-rasterizer/ \|url-status=live }}</ref>
	* The [[JavaScript]] plugin is open source (the [[Rhino (JavaScript engine)\|JavaScript engine]] itself was open source from the beginning).<ref>{{cite web \| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| title=Javascript is encumbered and there is no javascript plugin support. \| publisher=[[IcedTea]] \| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.'' \| date=2008-03-11 \| accessdate=2008-06-01 \| archive-date=2008-09-27 \| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| url-status=dead}}</ref>		* The [[JavaScript]] plugin is open source (the [[Rhino (JavaScript engine)\|JavaScript engine]] itself was open source from the beginning).<ref>{{cite web \| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| title=Javascript is encumbered and there is no javascript plugin support. \| publisher=[[IcedTea]] \| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.'' \| date=2008-03-11 \| accessdate=2008-06-01 \| archive-date=2008-09-27 \| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| url-status=dead}}</ref>

Ost316: Rescuing 10 sources and tagging 0 as dead.) #IABot (v2.0.9.5

2024-08-07T18:22:04Z

Rescuing 10 sources and tagging 0 as dead.) #IABot (v2.0.9.5

Sink Cat: Fill bare ref, fix citations

2024-06-27T19:18:33Z

Fill bare ref, fix citations

Show changes

Sink Cat: Added 1 {{Bare URL inline}} tag(s) using a script. For other recently-tagged pages with bare URLs, see :Category:Articles with bare URLs for citations from June 2024

2024-06-27T19:06:02Z

Added 1 {{Bare URL inline}} tag(s) using a script. For other recently-tagged pages with bare URLs, see Category:Articles with bare URLs for citations from June 2024

← Previous revision		Revision as of 19:06, 27 June 2024
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	Before the release of OpenJDK, the [[Java Development Kit\|JDK]] was based on a [[Proprietary software\|proprietary license]].		Before the release of OpenJDK, the [[Java Development Kit\|JDK]] was based on a [[Proprietary software\|proprietary license]].

	Following their promise to release a fully buildable [[Java Development Kit\|JDK]] based on almost completely free and open-source code in the first half of 2007,<ref>http://www.sun.com/software/opensource/java/faq.jsp#b4</ref> Sun released the complete [[source code]] of the Class Library under the [[GPL]] 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.<ref>{{cite web		Following their promise to release a fully buildable [[Java Development Kit\|JDK]] based on almost completely free and open-source code in the first half of 2007,<ref>http://www.sun.com/software/opensource/java/faq.jsp#b4 {{Bare URL inline\|date=June 2024}}</ref> Sun released the complete [[source code]] of the Class Library under the [[GPL]] 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.<ref>{{cite web
	\| url=http://mail.openjdk.java.net/pipermail/announce/2007-May.txt		\| url=http://mail.openjdk.java.net/pipermail/announce/2007-May.txt
	\| title=Open JDK is here!		\| title=Open JDK is here!

Billjones94: ndash

2023-12-08T17:19:27Z

ndash

← Previous revision		Revision as of 17:19, 8 December 2023
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	\|url-status = dead		\|url-status = dead
	\|archive-date = 2011-10-04		\|archive-date = 2011-10-04
	\|title = Gervill - Software Synthesizer		\|title = Gervill – Software Synthesizer
	\|accessdate = 2008-06-01		\|accessdate = 2008-06-01
	}}</ref>		}}</ref>

Cngzz1: /* Main features */ Fixed grammar

2023-06-19T12:28:14Z

Main features: Fixed grammar

← Previous revision		Revision as of 12:28, 19 June 2023
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	* [[Input/output\|I/O]] and [[Computer networking\|networking]] access the platform [[file system]], and more generally [[Computer network\|networks]] through the {{Javadoc:SE\|package=java.io\|java/io}}, {{Javadoc:SE\|package=java.nio\|java/nio}} and {{Javadoc:SE\|package=java.net\|java/net}} packages. For networking, [[SCTP]] is available through {{Javadoc:SE\|package=com.sun.nio.sctp\|com/sun/nio/sctp\|module=jdk.sctp}}.		* [[Input/output\|I/O]] and [[Computer networking\|networking]] access the platform [[file system]], and more generally [[Computer network\|networks]] through the {{Javadoc:SE\|package=java.io\|java/io}}, {{Javadoc:SE\|package=java.nio\|java/nio}} and {{Javadoc:SE\|package=java.net\|java/net}} packages. For networking, [[SCTP]] is available through {{Javadoc:SE\|package=com.sun.nio.sctp\|com/sun/nio/sctp\|module=jdk.sctp}}.
	* [[java.math\|Mathematics package]]: {{Javadoc:SE\|package=java.math\|java/math}} provides mathematical expressions and evaluation, as well as arbitrary-precision decimal and integer number datatypes.		* [[java.math\|Mathematics package]]: {{Javadoc:SE\|package=java.math\|java/math}} provides mathematical expressions and evaluation, as well as arbitrary-precision decimal and integer number datatypes.
	* [[Collection class\|Collections]] and Utilities : built-in Collection [[data structure]]s, and utility classes, for [[~~Regular~~ expression]]s, [[Concurrent computing\|~~Concurrency~~]], [[Computer data logging\|logging]] and [[~~Data~~ compression]].		* [[Collection class\|Collections]] and Utilities : built-in Collection [[data structure]]s, and utility classes, for [[regular expression]]s, [[Concurrent computing\|concurrency]], [[Computer data logging\|logging]] and [[data compression]].
	* [[GUI]] and [[2D computer graphics\|2D Graphics]]: the [[Abstract Window Toolkit\|AWT]] package ({{Javadoc:SE\|package=java.awt\|java/awt\|module=java.desktop}}) basic GUI operations and binds to the underlying native system. It also contains the 2D Graphics API. The [[Swing (java)\|Swing]] package ({{Javadoc:SE\|package=javax.swing\|javax/swing\|module=java.desktop}}) is built on AWT and provides a platform-independent [[widget toolkit]], as well as a [[~~Pluggable~~ look and feel]]. It also deals with editable and non-editable text components.		* [[GUI]] and [[2D computer graphics\|2D Graphics]]: the [[Abstract Window Toolkit\|AWT]] package ({{Javadoc:SE\|package=java.awt\|java/awt\|module=java.desktop}}) basic GUI operations and binds to the underlying native system. It also contains the 2D Graphics API. The [[Swing (java)\|Swing]] package ({{Javadoc:SE\|package=javax.swing\|javax/swing\|module=java.desktop}}) is built on AWT and provides a platform-independent [[widget toolkit]], as well as a [[pluggable look and feel]]. It also deals with editable and non-editable text components.
	* Sound: interfaces and classes for reading, writing, [[Music sequencer\|sequencing]], and [[Synthesizer\|synthesizing]] of sound data.		* Sound: interfaces and classes for reading, writing, [[Music sequencer\|sequencing]], and [[Synthesizer\|synthesizing]] of sound data.
	* Text: {{Javadoc:SE\|package=java.text\|java/text}} deals with text, dates, numbers and messages.		* Text: {{Javadoc:SE\|package=java.text\|java/text}} deals with text, dates, numbers and messages.

InternetArchiveBot: Rescuing 2 sources and tagging 0 as dead.) #IABot (v2.0.9.3) (Whoop whoop pull up - 13006

2023-03-29T20:55:49Z

Rescuing 2 sources and tagging 0 as dead.) #IABot (v2.0.9.3) (Whoop whoop pull up - 13006

← Previous revision		Revision as of 20:55, 29 March 2023
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	\| publisher=[[Oracle Corporation]]		\| publisher=[[Oracle Corporation]]
	\| date=2015-10-23		\| date=2015-10-23
	\| accessdate=2015-11-29~~}}</ref>~~		\| accessdate=2015-11-29
			\| archive-date=2015-12-08
			\| archive-url=https://web.archive.org/web/20151208074800/http://cr.openjdk.java.net/~mr/jigsaw/ea/module-summary.html
			\| url-status=dead
			}}</ref>

	==Conformance==		==Conformance==
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	\| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85		\| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85
	\| title=Javascript is encumbered and there is no javascript plugin support.		\| title=Javascript is encumbered and there is no javascript plugin support.
	\|publisher=[[IcedTea]]		\| publisher=[[IcedTea]]
	\| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.''		\| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.''
	\| date=2008-03-11		\| date=2008-03-11
	\| accessdate=2008-06-01~~}}</ref>~~		\| accessdate=2008-06-01
			\| archive-date=2008-09-27
			\| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85
			\| url-status=dead
			}}</ref>

	===Open source release===		===Open source release===

← Previous revision		Revision as of 22:39, 24 February 2025
Line 1:		Line 1:
			{{Short description\|Core Java libraries}}
	{{more citations needed\|date=August 2011}}		{{more citations needed\|date=August 2011}}
	The '''Java Class Library''' ('''JCL''') is a set of [[Library (computer science)#Dynamic linking\|dynamically loadable libraries]] that [[List of JVM languages\|Java Virtual Machine (JVM) languages]] can call at [[Run time (program lifecycle phase)\|run time]]. Because the [[Java Platform]] is not dependent on a specific [[operating system]], applications cannot rely on any of the platform-native libraries. Instead, the Java Platform provides a comprehensive set of [[Standard library\|standard class libraries]], containing the functions common to modern operating systems.		The '''Java Class Library''' ('''JCL''') is a set of [[Library (computer science)#Dynamic linking\|dynamically loadable libraries]] that [[List of JVM languages\|Java Virtual Machine (JVM) languages]] can call at [[Run time (program lifecycle phase)\|run time]]. Because the [[Java Platform]] is not dependent on a specific [[operating system]], applications cannot rely on any of the platform-native libraries. Instead, the Java Platform provides a comprehensive set of [[Standard library\|standard class libraries]], containing the functions common to modern operating systems.

← Previous revision		Revision as of 12:28, 19 June 2023
Line 37:		Line 37:
	* [[Input/output\|I/O]] and [[Computer networking\|networking]] access the platform [[file system]], and more generally [[Computer network\|networks]] through the {{Javadoc:SE\|package=java.io\|java/io}}, {{Javadoc:SE\|package=java.nio\|java/nio}} and {{Javadoc:SE\|package=java.net\|java/net}} packages. For networking, [[SCTP]] is available through {{Javadoc:SE\|package=com.sun.nio.sctp\|com/sun/nio/sctp\|module=jdk.sctp}}.		* [[Input/output\|I/O]] and [[Computer networking\|networking]] access the platform [[file system]], and more generally [[Computer network\|networks]] through the {{Javadoc:SE\|package=java.io\|java/io}}, {{Javadoc:SE\|package=java.nio\|java/nio}} and {{Javadoc:SE\|package=java.net\|java/net}} packages. For networking, [[SCTP]] is available through {{Javadoc:SE\|package=com.sun.nio.sctp\|com/sun/nio/sctp\|module=jdk.sctp}}.
	* [[java.math\|Mathematics package]]: {{Javadoc:SE\|package=java.math\|java/math}} provides mathematical expressions and evaluation, as well as arbitrary-precision decimal and integer number datatypes.		* [[java.math\|Mathematics package]]: {{Javadoc:SE\|package=java.math\|java/math}} provides mathematical expressions and evaluation, as well as arbitrary-precision decimal and integer number datatypes.
	* [[Collection class\|Collections]] and Utilities : built-in Collection [[data structure]]s, and utility classes, for [[~~Regular~~ expression]]s, [[Concurrent computing\|~~Concurrency~~]], [[Computer data logging\|logging]] and [[~~Data~~ compression]].		* [[Collection class\|Collections]] and Utilities : built-in Collection [[data structure]]s, and utility classes, for [[regular expression]]s, [[Concurrent computing\|concurrency]], [[Computer data logging\|logging]] and [[data compression]].
	* [[GUI]] and [[2D computer graphics\|2D Graphics]]: the [[Abstract Window Toolkit\|AWT]] package ({{Javadoc:SE\|package=java.awt\|java/awt\|module=java.desktop}}) basic GUI operations and binds to the underlying native system. It also contains the 2D Graphics API. The [[Swing (java)\|Swing]] package ({{Javadoc:SE\|package=javax.swing\|javax/swing\|module=java.desktop}}) is built on AWT and provides a platform-independent [[widget toolkit]], as well as a [[~~Pluggable~~ look and feel]]. It also deals with editable and non-editable text components.		* [[GUI]] and [[2D computer graphics\|2D Graphics]]: the [[Abstract Window Toolkit\|AWT]] package ({{Javadoc:SE\|package=java.awt\|java/awt\|module=java.desktop}}) basic GUI operations and binds to the underlying native system. It also contains the 2D Graphics API. The [[Swing (java)\|Swing]] package ({{Javadoc:SE\|package=javax.swing\|javax/swing\|module=java.desktop}}) is built on AWT and provides a platform-independent [[widget toolkit]], as well as a [[pluggable look and feel]]. It also deals with editable and non-editable text components.
	* Sound: interfaces and classes for reading, writing, [[Music sequencer\|sequencing]], and [[Synthesizer\|synthesizing]] of sound data.		* Sound: interfaces and classes for reading, writing, [[Music sequencer\|sequencing]], and [[Synthesizer\|synthesizing]] of sound data.
	* Text: {{Javadoc:SE\|package=java.text\|java/text}} deals with text, dates, numbers and messages.		* Text: {{Javadoc:SE\|package=java.text\|java/text}} deals with text, dates, numbers and messages.

← Previous revision		Revision as of 18:22, 7 August 2024
Line 10:		Line 10:
	JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]). The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.		JCL is almost entirely written in Java, except for the parts that need direct access to the [[Computer hardware\|hardware]] and [[operating system]] (such as for [[Input/output\|I/O]] or [[Rasterisation\|bitmap graphics]]). The classes that give access to these functions commonly use [[Java Native Interface]] wrappers to access operating system [[API]]s.

	Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05}}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.		Almost all of JCL is stored in a single [[JAR (file format)\|Java archive]] file called "rt.jar" which is provided with [[Java Runtime Environment\|JRE]] and [[Java Development Kit\|JDK]] distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpath<ref>{{cite web \| url=http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| title=How Classes are Found \| publisher=[[Oracle Corporation]] \| accessdate=2015-12-05 \| archive-date=2009-04-25 \| archive-url=https://web.archive.org/web/20090425152829/http://java.sun.com/javase/6/docs/technotes/tools/findingclasses.html \| url-status=live }}</ref> and does not have to appear in the [[Classpath (Java)\|classpath]] declared for the application. The [[Java Runtime Environment\|runtime]] uses the bootstrap class loader to find the JCL.

	The [[Java Module System]] (part of the [[Java 9]] release) broke the monolithic "rt.jar" JAR file and modularized the JCL itself in several modules with specified dependencies.<ref>{{cite web \| url=http://cr.openjdk.java.net/~mr/jigsaw/ea/module-summary.html \| title=JDK Module Summary \| publisher=[[Oracle Corporation]] \| date=2015-10-23 \| accessdate=2015-11-29 \| archive-date=2015-12-08 \| archive-url=https://web.archive.org/web/20151208074800/http://cr.openjdk.java.net/~mr/jigsaw/ea/module-summary.html \| url-status=dead}}</ref>		The [[Java Module System]] (part of the [[Java 9]] release) broke the monolithic "rt.jar" JAR file and modularized the JCL itself in several modules with specified dependencies.<ref>{{cite web \| url=http://cr.openjdk.java.net/~mr/jigsaw/ea/module-summary.html \| title=JDK Module Summary \| publisher=[[Oracle Corporation]] \| date=2015-10-23 \| accessdate=2015-11-29 \| archive-date=2015-12-08 \| archive-url=https://web.archive.org/web/20151208074800/http://cr.openjdk.java.net/~mr/jigsaw/ea/module-summary.html \| url-status=dead}}</ref>
Line 42:		Line 42:
	Before the release of OpenJDK, the [[Java Development Kit\|JDK]] was based on a [[Proprietary software\|proprietary license]].		Before the release of OpenJDK, the [[Java Development Kit\|JDK]] was based on a [[Proprietary software\|proprietary license]].

	Following their promise to release a fully buildable [[Java Development Kit\|JDK]] based on almost completely free and open-source code in the first half of 2007,<ref>{{Cite web \|date=May 2007 \|title=Free and Open Source Java - FAQ \|url=http://www.sun.com/software/opensource/java/faq.jsp#b4 \|url-status=dead \|archive-url=https://web.archive.org/web/20070522170749/http://www.sun.com/software/opensource/java/faq.jsp#b4 \|archive-date=May 22, 2007 \|access-date=2024-06-27 \|website=sun.com \|language=en}}</ref> Sun released the complete [[source code]] of the Class Library under the [[GPL]] 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.<ref>{{cite web \| url=http://mail.openjdk.java.net/pipermail/announce/2007-May.txt \| title=Open JDK is here! \| author=Rich Green \| publisher=[[Sun Microsystems]] \| date=2007-05-08 \| accessdate=2011-11-25}}</ref> 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.		Following their promise to release a fully buildable [[Java Development Kit\|JDK]] based on almost completely free and open-source code in the first half of 2007,<ref>{{Cite web \|date=May 2007 \|title=Free and Open Source Java - FAQ \|url=http://www.sun.com/software/opensource/java/faq.jsp#b4 \|url-status=dead \|archive-url=https://web.archive.org/web/20070522170749/http://www.sun.com/software/opensource/java/faq.jsp#b4 \|archive-date=May 22, 2007 \|access-date=2024-06-27 \|website=sun.com \|language=en}}</ref> Sun released the complete [[source code]] of the Class Library under the [[GPL]] 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.<ref>{{cite web \| url=http://mail.openjdk.java.net/pipermail/announce/2007-May.txt \| title=Open JDK is here! \| author=Rich Green \| publisher=[[Sun Microsystems]] \| date=2007-05-08 \| accessdate=2011-11-25 \| archive-date=2012-02-07 \| archive-url=https://web.archive.org/web/20120207052347/http://mail.openjdk.java.net/pipermail/announce/2007-May.txt \| url-status=live }}</ref> 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.

	Until December 2010, the remaining encumbered part of the JDK was made available by [[Sun Microsystems\|Sun]] then [[Oracle Corporation\|Oracle]] as ''Binary Plugs''<ref>{{cite web \| url=http://openjdk.java.net/legal/binary-plugs-2007-05-08.html \| title=OpenJDK Binary Plugs \| publisher=[[Sun Microsystems]] \| date=2007-05-08 \| accessdate=2011-11-25 \| archive-url=https://web.archive.org/web/20120826021741/http://openjdk.java.net/legal/binary-plugs-2007-05-08.html \| archive-date=2012-08-26 \| url-status=dead}}</ref> which were required to build the JDK but not necessary to run it. {{As of\|lc=y\|2007\|05}}, the only part of the Class library that remained proprietary and closed-source (4% {{as of\|lc=y\|2007\|05}} for OpenJDK 7,<ref>{{cite web \| url=http://fitzsim.org/blog/?p=17 \| title=Plans for OpenJDK \| last=Fitzsimmons\|first=Thomas \| date=2007-05-18 \| accessdate=2007-05-22}}</ref> and less than 1% {{as of\|lc=y\|2008\|05}} and OpenJDK 6<ref>{{cite web \|url = http://langel.wordpress.com/2008/03/13/openjdk-in-fedora-9/ \|title = OpenJDK to replace IcedTea in Fedora 9 \|last = Angel \|first = Lillian \|date = 2008-03-13 \|accessdate = 2008-04-05 \|url-status = dead \|archiveurl = https://archive.today/20121210052442/http://langel.wordpress.com/2008/03/13/openjdk-in-fedora-9/ \|archivedate = 2012-12-10}}</ref><ref>{{cite web \| url=http://developer.redhatmagazine.com/2008/03/12/openjdk-to-replace-icedtea-in-fedora-9/ \| title=OpenJDK in Fedora 9! \| last=Wade \| first=Karsten \| publisher=redhatmagazine.com \| quote=''Thomas Fitzsimmons updated the Fedora 9 release notes source pages to reflect that Fedora 9 would ship with OpenJDK 6 instead of the IcedTea implementation of OpenJDK 7. Fedora 9 (Sulphur) is due to release in May 2008.'' \| date=2008-03-13 \| accessdate=2008-04-05 \| archive-url=https://web.archive.org/web/20080421100346/http://developer.redhatmagazine.com/2008/03/12/openjdk-to-replace-icedtea-in-fedora-9/ \| archive-date=2008-04-21 \| url-status=dead}}</ref>) was<ref>{{cite web \|url = http://weblogs.java.net/blog/robogeek/archive/2007/10/openjdk_encumbr.html \|title = Plans for OpenJDK \|last = Herron \|first = David \|date = 2007-10-04 \|accessdate = 2007-10-09 \|url-status = dead \|archiveurl = https://web.archive.org/web/20071011014156/http://weblogs.java.net/blog/robogeek/archive/2007/10/openjdk_encumbr.html \|archivedate = 2007-10-11}}</ref> the [[Simple Network Management Protocol\|SNMP]] implementation.<ref name="openjdkb10">{{cite web \|url=http://mail.openjdk.java.net/pipermail/jdk6-dev/2008-May/000058.html \|title=OpenJDK 6 b10 source posted \|date=2008-05-30 \|accessdate=2008-06-01}}</ref>		Until December 2010, the remaining encumbered part of the JDK was made available by [[Sun Microsystems\|Sun]] then [[Oracle Corporation\|Oracle]] as ''Binary Plugs''<ref>{{cite web \| url=http://openjdk.java.net/legal/binary-plugs-2007-05-08.html \| title=OpenJDK Binary Plugs \| publisher=[[Sun Microsystems]] \| date=2007-05-08 \| accessdate=2011-11-25 \| archive-url=https://web.archive.org/web/20120826021741/http://openjdk.java.net/legal/binary-plugs-2007-05-08.html \| archive-date=2012-08-26 \| url-status=dead}}</ref> which were required to build the JDK but not necessary to run it. {{As of\|lc=y\|2007\|05}}, the only part of the Class library that remained proprietary and closed-source (4% {{as of\|lc=y\|2007\|05}} for OpenJDK 7,<ref>{{cite web \| url=http://fitzsim.org/blog/?p=17 \| title=Plans for OpenJDK \| last=Fitzsimmons\|first=Thomas \| date=2007-05-18 \| accessdate=2007-05-22}}</ref> and less than 1% {{as of\|lc=y\|2008\|05}} and OpenJDK 6<ref>{{cite web \|url = http://langel.wordpress.com/2008/03/13/openjdk-in-fedora-9/ \|title = OpenJDK to replace IcedTea in Fedora 9 \|last = Angel \|first = Lillian \|date = 2008-03-13 \|accessdate = 2008-04-05 \|url-status = dead \|archiveurl = https://archive.today/20121210052442/http://langel.wordpress.com/2008/03/13/openjdk-in-fedora-9/ \|archivedate = 2012-12-10}}</ref><ref>{{cite web \| url=http://developer.redhatmagazine.com/2008/03/12/openjdk-to-replace-icedtea-in-fedora-9/ \| title=OpenJDK in Fedora 9! \| last=Wade \| first=Karsten \| publisher=redhatmagazine.com \| quote=''Thomas Fitzsimmons updated the Fedora 9 release notes source pages to reflect that Fedora 9 would ship with OpenJDK 6 instead of the IcedTea implementation of OpenJDK 7. Fedora 9 (Sulphur) is due to release in May 2008.'' \| date=2008-03-13 \| accessdate=2008-04-05 \| archive-url=https://web.archive.org/web/20080421100346/http://developer.redhatmagazine.com/2008/03/12/openjdk-to-replace-icedtea-in-fedora-9/ \| archive-date=2008-04-21 \| url-status=dead}}</ref>) was<ref>{{cite web \|url = http://weblogs.java.net/blog/robogeek/archive/2007/10/openjdk_encumbr.html \|title = Plans for OpenJDK \|last = Herron \|first = David \|date = 2007-10-04 \|accessdate = 2007-10-09 \|url-status = dead \|archiveurl = https://web.archive.org/web/20071011014156/http://weblogs.java.net/blog/robogeek/archive/2007/10/openjdk_encumbr.html \|archivedate = 2007-10-11}}</ref> the [[Simple Network Management Protocol\|SNMP]] implementation.<ref name="openjdkb10">{{cite web \|url=http://mail.openjdk.java.net/pipermail/jdk6-dev/2008-May/000058.html \|title=OpenJDK 6 b10 source posted \|date=2008-05-30 \|accessdate=2008-06-01 \|archive-date=2009-06-18 \|archive-url=https://web.archive.org/web/20090618054843/http://mail.openjdk.java.net/pipermail/jdk6-dev/2008-May/000058.html \|url-status=live }}</ref>

	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:		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:
	* All the audio engine code, including the [[Musical Instrument Digital Interface\|software synthesizer]], became open source.<ref name="openjdkb10" /><ref>[http://openjdk.java.net/projects/audio-engine/ audio-engine project page]</ref> The closed-source software synthesizer has been replaced by a new synthesizer developed specifically for OpenJDK called ''Gervill'',<ref>{{cite web \|url = https://gervill.dev.java.net/ \|archive-url = https://archive.today/20111004052704/https://gervill.dev.java.net/ \|url-status = dead \|archive-date = 2011-10-04 \|title = Gervill – Software Synthesizer \|accessdate = 2008-06-01}}</ref>		* All the audio engine code, including the [[Musical Instrument Digital Interface\|software synthesizer]], became open source.<ref name="openjdkb10" /><ref>{{Cite web \|url=http://openjdk.java.net/projects/audio-engine/ \|title=audio-engine project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132340/http://openjdk.java.net/projects/audio-engine/ \|url-status=live }}</ref> The closed-source software synthesizer has been replaced by a new synthesizer developed specifically for OpenJDK called ''Gervill'',<ref>{{cite web \|url = https://gervill.dev.java.net/ \|archive-url = https://archive.today/20111004052704/https://gervill.dev.java.net/ \|url-status = dead \|archive-date = 2011-10-04 \|title = Gervill – Software Synthesizer \|accessdate = 2008-06-01}}</ref>
	* All [[cryptography]] classes were released as open-source,<ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/security-dev/2007-September/000015.html \|title=Crypto has been added to OpenJDK \|date=2007-09-27 \|accessdate=2007-10-07}}</ref>		* All [[cryptography]] classes were released as open-source,<ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/security-dev/2007-September/000015.html \|title=Crypto has been added to OpenJDK \|date=2007-09-27 \|accessdate=2007-10-07 \|archive-date=2007-12-25 \|archive-url=https://web.archive.org/web/20071225035137/http://mail.openjdk.java.net/pipermail/security-dev/2007-September/000015.html \|url-status=live }}</ref>
	* The code that scales and [[Rasterisation\|rasterizes]] [[Computer font\|fonts]] uses open source [[FreeType]]<ref>[http://openjdk.java.net/projects/font-scaler/ font-scaler projectpage]</ref><ref name="2dproject">[http://openjdk.java.net/groups/2d/ Java2D project page]</ref><ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|title=Freetype font rasteriser \|date=2007-08-07 \|accessdate=2007-11-24}}</ref>		* The code that scales and [[Rasterisation\|rasterizes]] [[Computer font\|fonts]] uses open source [[FreeType]]<ref>{{Cite web \|url=http://openjdk.java.net/projects/font-scaler/ \|title=font-scaler projectpage \|access-date=2007-05-19 \|archive-date=2015-06-10 \|archive-url=https://web.archive.org/web/20150610021721/http://openjdk.java.net/projects/font-scaler/ \|url-status=live }}</ref><ref name="2dproject">{{Cite web \|url=http://openjdk.java.net/groups/2d/ \|title=Java2D project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132229/http://openjdk.java.net/groups/2d/ \|url-status=live }}</ref><ref>{{cite web \|url=http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|title=Freetype font rasteriser \|date=2007-08-07 \|accessdate=2007-11-24 \|archive-date=2009-01-07 \|archive-url=https://web.archive.org/web/20090107195849/http://mail.openjdk.java.net/pipermail/font-scaler-dev/2007-August/000011.html \|url-status=live }}</ref>
	* The native [[color management]] uses open-source [[LittleCMS]].<ref name="2dproject" /> 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.		* The native [[color management]] uses open-source [[LittleCMS]].<ref name="2dproject" /> 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.
	* The [[Spatial anti-aliasing\|anti-aliasing]] graphics [[Rasterisation\|rasterizer]] code uses the open source Pisces renderer used in the [[phoneME]] project.<ref name="2dproject" /><ref>[https://phoneme.dev.java.net/ phoneme.dev.java.net/] {{webarchive\|url=https://web.archive.org/web/20070610234355/https://phoneme.dev.java.net/ \|date=2007-06-10}}</ref><ref>[http://openjdk.java.net/projects/graphics-rasterizer/ graphics-rasterizer project page]</ref>		* The [[Spatial anti-aliasing\|anti-aliasing]] graphics [[Rasterisation\|rasterizer]] code uses the open source Pisces renderer used in the [[phoneME]] project.<ref name="2dproject" /><ref>[https://phoneme.dev.java.net/ phoneme.dev.java.net/] {{webarchive\|url=https://web.archive.org/web/20070610234355/https://phoneme.dev.java.net/ \|date=2007-06-10}}</ref><ref>{{Cite web \|url=http://openjdk.java.net/projects/graphics-rasterizer/ \|title=graphics-rasterizer project page \|access-date=2007-05-19 \|archive-date=2007-05-16 \|archive-url=https://web.archive.org/web/20070516132602/http://openjdk.java.net/projects/graphics-rasterizer/ \|url-status=live }}</ref>
	* The [[JavaScript]] plugin is open source (the [[Rhino (JavaScript engine)\|JavaScript engine]] itself was open source from the beginning).<ref>{{cite web \| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| title=Javascript is encumbered and there is no javascript plugin support. \| publisher=[[IcedTea]] \| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.'' \| date=2008-03-11 \| accessdate=2008-06-01 \| archive-date=2008-09-27 \| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| url-status=dead}}</ref>		* The [[JavaScript]] plugin is open source (the [[Rhino (JavaScript engine)\|JavaScript engine]] itself was open source from the beginning).<ref>{{cite web \| url=http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| title=Javascript is encumbered and there is no javascript plugin support. \| publisher=[[IcedTea]] \| quote=''Changing Summary. JavaScript is no longer encumbered, but we still need liveconnect support.'' \| date=2008-03-11 \| accessdate=2008-06-01 \| archive-date=2008-09-27 \| archive-url=https://web.archive.org/web/20080927185957/http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=85 \| url-status=dead}}</ref>

	===Open source release===		===Open source release===
	Beginning in December 2010, all the so-called ''binary plugs'' were replaced by [[Open-source model\|open source]] replacements, making the entire JDK open.<ref>{{cite web \| url=http://mail.openjdk.java.net/pipermail/build-dev/2010-December/003881.html \| title=OpenJDK7 and OpenJDK6 Binary Plugs Logic Removed \| author=Kelly O'Hair \| publisher=[[Oracle Corporation]] \| date=December 2010 \| accessdate=2011-11-25}}</ref>		Beginning in December 2010, all the so-called ''binary plugs'' were replaced by [[Open-source model\|open source]] replacements, making the entire JDK open.<ref>{{cite web \| url=http://mail.openjdk.java.net/pipermail/build-dev/2010-December/003881.html \| title=OpenJDK7 and OpenJDK6 Binary Plugs Logic Removed \| author=Kelly O'Hair \| publisher=[[Oracle Corporation]] \| date=December 2010 \| accessdate=2011-11-25 \| archive-date=2022-04-07 \| archive-url=https://web.archive.org/web/20220407115622/http://mail.openjdk.java.net/pipermail/build-dev/2010-December/003881.html \| url-status=live }}</ref>

	==Alternative implementations==		==Alternative implementations==