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<h1 class="topictitle1">Sun Microsystems, Inc. Java Development Kit</h1>
<div><p>The Java™ Development Kit (JDK) is software that is distributed
by Sun Microsystems, Inc. for Java developers. It includes the Java interpreter, Java classes,
and Java development
tools: compiler, debugger, disassembler, appletviewer, stub file generator,
and documentation generator.</p>
<p>The JDK enables you to write applications that are developed once and run
anywhere on any Java virtual machine. Java applications that are developed with
the JDK on one system can be used on another system without changing or recompiling
the code. The Java class files are portable to any standard Java virtual
machine.</p>
<p>To find more information about the current JDK, check the version of the IBM<sup>®</sup> Developer
Kit for Java on your iSeries™ server.</p>
<p>You can check the version of the default IBM Developer Kit for Java Java virtual
machine on your iSeries server
by entering either of the following commands:</p>
<ul><li><samp class="codeph">java -version</samp> on the Qshell command prompt.</li>
<li><samp class="codeph">RUNJVA CLASS(*VERSION)</samp> on the CL command line.</li>
</ul>
<p>Then, look for the same version of Sun Microsystems, Inc. JDK at <a href="http://www.java.sun.com/" target="_blank">The Source
for Java Technology
java.sun.com</a> for specific documentation. The IBM Developer Kit for Java is
a compatible implementation of the Sun Microsystems, Inc. Java Technology,
so you should be familiar with their JDK documentation.</p>
<p>See the following topics for more information:</p>
<ul><li><p><a href="multjdk.htm">Support for multiple Java Development
Kits (JDKs)</a> provides information about using different Java virtual
machines.</p>
</li>
<li><a href="nmjni.htm">Native methods and the Java Native Interface</a> defines what
a native method is and what they do. This topic also briefly explains the Java Native
Interface.</li>
</ul>
<div class="section"><h4 class="sectiontitle">Java packages</h4><p>A Java package is a way of grouping related
classes and interfaces in Java. Java packages are similar to class libraries
that are available in other languages.</p>
<p>The Java packages, which provide the Java APIs,
are available as part of Sun Microsystems, Inc. Java Development Kit (JDK). For a complete
list of Java packages and information on Java APIs,
see <a href="javaapi/api/overview-summary.html" target="_blank">Java 2
Platform Packages</a>. </p>
</div>
<div class="section"><h4 class="sectiontitle">Java tools</h4><p>For a complete list of tools that
Sun Microsystems, Inc. Java Development Kit supplies, see <a href="javaapi/tooldocs/tools.html" target="_blank">Tools Reference
by Sun Microsystems, Inc.</a> For more information about each individual
tool that the IBM Developer
Kit for Java supports, see <a href="tools.htm">Java tools
that are supported by the IBM Developer Kit for Java</a>.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="platform.htm" title="The Java platform is the environment for developing and managing Java applets and applications. It consists of three primary components: the Java language, the Java packages, and the Java virtual machine.">Java platform</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="appsappl.htm" title="An applet is a Java program designed to be included in an HTML Web document. You can write your Java applet and include it in an HTML page, much in the same way an image is included. When you use a Java-enabled browser to view an HTML page that contains an applet, the applet's code is transferred to your system and is run by the browser's Java virtual machine.">Java applets and applications</a></div>
<div><a href="javavirm.htm" title="The Java virtual machine is a runtime environment that you can add into a web browser or any operating system, such as IBM i5/OS. The Java virtual machine runs instructions that a Java compiler generates. It consists of a bytecode interpreter and runtime that allow Java class files to run on any platform, regardless of the platform on which they were originally developed.">Java virtual machine</a></div>
<div><a href="jarfile.htm" title="A Java ARchive (JAR) file is a file format that combines many files into one. The Java environment differs from other programming environments in that the Java compiler does not generate machine code for a hardware-specific instruction set. Instead, the Java compiler converts Java source code into Java virtual machine instructions, which Java class files store. You can use JAR files to store class files. The class file does not target a specific hardware platform, but instead targets the Java virtual machine architecture.">Java JAR and class files</a></div>
<div><a href="threads.htm" title="A thread is a single independent stream that runs within a program. Java is a multithreaded programming language, so more than one thread may be running within the Java virtual machine at one time. Java threads provide a way for a Java program to perform multiple tasks at the same time. A thread is essentially a flow of control in a program.">Java threads</a></div>
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