Java Development Kit
The Java
Development Kit (JDK) is an implementation of either one of the Java SE, Java EE or Java ME platforms[1] released byOracle Corporation in the form of a
binary product aimed at Java developers on Solaris, Linux, Mac OS X or Windows. The JDK includes a private JVM and a few other
resources to finish the development of a Java Application.[2] Since the introduction of theJava platform, it has
been by far the most widely used Software Development Kit (SDK).[citation
needed] On 17 November 2006, Sun announced
that they would release it under the GNU General
Public License (GPL), thus making it free software. This
happened in large part on 8 May 2007, when Sun contributed the source code to
the OpenJDK.
DK contents
The
JDK has as its primary components a collection of programming tools, including:
extcheck
– a utility that detects JAR file conflicts
java
– the loader for Java applications.
This tool is an interpreter and can interpret the class files generated by the javac compiler. Now a single launcher is used for both
development and deployment. The old deployment launcher, jre, no longer comes with Sun JDK, and
instead it has been replaced by this new java loader.
javadoc – the documentation
generator, which automatically generates documentation from source code comments
jar
– the archiver, which packages related class libraries into a single JAR file. This tool
also helps manage JAR files.
javafxpackager
– tool to package and sign JavaFX applications
jarsigner
– the jar signing and verification tool
javah
– the C header and stub generator, used to write native methods
jhat
– Java Heap Analysis Tool (experimental)
jinfo
– This utility gets configuration information from a running Java process or
crash dump. (experimental)
jmap
– This utility outputs the memory map for Java and can print shared object
memory maps or heap memory details of a given process or core dump.
(experimental)
jmc
– Java Mission Control
jps
– Java Virtual Machine Process Status Tool lists the instrumented HotSpot Java
Virtual Machines (JVMs) on the target system. (experimental)
jstatd
– jstat daemon (experimental)
policytool
– the policy creation and management tool, which can determine policy for a
Java runtime, specifying which permissions are available for code from various
sources
VisualVM – visual tool
integrating several command-line JDK tools and lightweight[clarification
needed] performance and memory profiling capabilities
xjc
– Part of the Java API for XML Binding (JAXB) API. It accepts an XML schema and
generates Java classes.
Experimental tools may not be available in
future versions of the JDK.
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