OpenJDK: Difference between revisions
→Usage
(Briefly describe OpenJDK; show how to use 'javac' and 'java'.) |
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{{implementation|Java}}
'''[http://openjdk.java.net/ OpenJDK]''' is an [[open source|free]] implementation of [[:Category:Java|Java]] for [[Linux]], [[Solaris]] and [[Windows]].<ref>[http://hg.openjdk.java.net/jdk7/build/raw-file/tip/README-builds.html#MBE OpenJDK Build README: Minimum Build Environments]</ref>
There is also OpenJDK for [[BSD]]<ref>[http://openjdk.java.net/projects/bsd-port/ OpenJDK: BSD Port Project]</ref>.
Several BSD and Linux distros carry packages of OpenJDK.
OpenJDK can compile and run Java programs.
OpenJDK 6 implements Java 6, while OpenJDK 7 is a preview of future Java 7.
== Usage ==
OpenJDK is a set of command-line tools.
If OpenJDK is installed in <kbd>/usr/local/jdk-1.7.0</kbd>, then <kbd>/usr/local/jdk-1.7.0/bin</kbd> needs to be added to the <kbd>PATH</kbd> environment variable.
The two most important tools are the [[javac]] compiler, and the java runner.
This example program would compute 12 - 4.
<syntaxhighlight lang="java">
public class TwelveMinusFour {
public static void main(String[] args) {
System.out.println(12 - 4);
}
}
</syntaxhighlight>
One can compile this program with <kbd>javac</kbd>, and run it with <kbd>java</kbd>.
<syntaxhighlight lang="bash">
$
$ java TwelveMinusFour
8
</syntaxhighlight>
== References ==
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