It consists of a Java Virtual Machine and all of the class libraries present in the production environment, as well as additional libraries only useful to developers, and such as the internationalization libraries and the IDL libraries. On the command line, type: su -c 'yum install java-1.8. Fedora, Oracle Linux, Red Hat Enterprise Linux, etc. If you want to develop Java programs then please install the openjdk-8-jdk package. The JDK also comes with a complete Java Runtime Environment, usually called a private runtime. sudo apt-get install openjdk-8-jre The openjdk-8-jre package contains just the Java Runtime Environment. This tool also helps manage JAR files, javadoc - the documentation generator, which automatically generates documentation from source code comments, jdb - the debugger, jps - the process status tool, which displays process information for current Java processes, javap - the class file disassembler, and so many other components.

JDK has as its primary components a collection of programming tools, including javac, jar, and the archiver, which packages related class libraries into a single JAR file. Java Development Kit contains the software and tools that you need to compile, debug, and run applets and applications that you've written using the Java programming language.

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