Oracle’s OpenJDK (open source) – you can use this for free in any environment. Oracle’s JDK (commercial) – you can use this in development and testing for free, but if you use it in production you have to pay for it. Instead of having a single JDK build which you can use for free, they now have two different JDK builds: Note that Oracle has changed the license of their JDK. The official reference implementation is maintained by Oracle. To do this the JRE uses Java libraries and a Java Virtual Machine (JVM) that executes the compiled Java code.ĭifferent JDK implementations are available. The JDK also contains a Java Runtime Environment (JRE) that is able to run compiled Java code. Other tools include an archiver (jar) and a documentation generator (javadoc). 
One of these development tools is a compiler (javac) that converts Java source code (.
It contains tools that allow you to develop and run your Java program. When you want to create a Java application you need a Java Development Kit (JDK). Check following guides if you are looking to download and install JDK 1.5, JDK 1.6, JDK 1.7, JDK 1.9 or JDK 1.10.
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