The JDK is a development environment for building applications, applets, and components using the Java programming language.
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For a list of pointers to packages of the BSD Port for DragonFly BSD, FreeBSD, Mac OS X, NetBSD and OpenBSD, please see the BSD porting Project's wiki page. If you want to develop Java programs then install the java-1.6.0-openjdk-devel package. The java-1.6.0-openjdk package contains just the Java Runtime Environment. Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by some product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.