(In the lib/ subdirectory) Additional class libraries and support files required by the development tools. The JRE includes a Java Virtual Machine (JVM), class libraries, and other files that support the execution of programs written in the Java programming language. (In the jre/ subdirectory) An implementation of the Java Runtime Environment (JRE) for use by the JDK. (In the bin/ subdirectory) Tools and utilities that will help you develop, execute, debug, and document programs are written in the JavaTM programming language. 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. The JDK also comes with a complete Java Runtime Environment, usually called a private runtime. 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 (also known as JDK) 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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