OpenJDK: Difference between revisions
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(Briefly describe OpenJDK; show how to use 'javac' and 'java'.) |
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{{implementation|Java}} |
{{implementation|Java}} |
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[http://openjdk.java.net/ OpenJDK] is an [[open source|free]] implementation of 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> |
'''[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> |
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There is also OpenJDK for [[BSD]]<ref>[http://openjdk.java.net/projects/bsd-port/ OpenJDK: BSD Port Project]</ref>. |
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Several BSD and Linux distros carry packages of OpenJDK. |
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OpenJDK can compile and run Java programs. |
OpenJDK can compile and run Java programs. |
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OpenJDK 6 implements Java 6, while OpenJDK 7 is a preview of future Java 7. |
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== Usage == |
== Usage == |
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OpenJDK is a set of command-line tools. |
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OpenJDK is a set of command-line tools. I have OpenJDK in <tt>/usr/local/jdk-1.7.0</tt>, so I added <tt>/usr/local/jdk-1.7.0/bin</tt> to my PATH. Now I can use the tools. The two most important tools are the [[javac]] compiler, and the java runner. |
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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. |
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The two most important tools are the [[javac]] compiler, and the java runner. |
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This example program would compute 12 - 4. |
This example program would compute 12 - 4. |
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<syntaxhighlight lang="java"> |
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/* TwelveMinusFour.java */ |
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public class TwelveMinusFour { |
public class TwelveMinusFour { |
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public static void main(String[] args) { |
public static void main(String[] args) { |
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System.out.println(12 - 4); |
System.out.println(12 - 4); |
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} |
} |
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} |
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}</lang> |
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</syntaxhighlight> |
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One can compile this program with javac, and run it with java. |
One can compile this program with <kbd>javac</kbd>, and run it with <kbd>java</kbd>. |
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<syntaxhighlight lang="bash"> |
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<lang bash>$ javac TwelveMinusFour.java |
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$ |
$ javac TwelveMinusFour.java |
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$ java TwelveMinusFour |
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8</lang> |
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8 |
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</syntaxhighlight> |
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== References == |
== References == |
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Latest revision as of 08:34, 21 July 2023
OpenJDK is an implementation of Java.
Other implementations of Java.
OpenJDK is an free implementation of Java for Linux, Solaris and Windows.[1] There is also OpenJDK for BSD[2]. 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 /usr/local/jdk-1.7.0, then /usr/local/jdk-1.7.0/bin needs to be added to the PATH environment variable. The two most important tools are the javac compiler, and the java runner.
This example program would compute 12 - 4.
/* TwelveMinusFour.java */
public class TwelveMinusFour {
public static void main(String[] args) {
System.out.println(12 - 4);
}
}
One can compile this program with javac, and run it with java.
$ javac TwelveMinusFour.java
$ java TwelveMinusFour
8