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Samples, with source code, of programming for certain Java API's. These include examples that use Swing and other Java Foundation Classes, and the Java Platform Debugger Architecture. Examples, with source code, of programming for the Javaplatform. 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. An implementation of the Java Runtime Environment (JRE) for use by the JDK.
Tools and utilities that will help you develop, execute, debug, and document programs written in the JavaTM programming language. This tool also helps to manage JAR files, javadoc-document generator, automatic generation of documents from source code comments, jdb-debugger, jps-process status tools, display process information of the current Java process, javap-class file disassembler, Other components are also included.
JDK has a set of programming tools, including javac, jar, and archiver, which package related class libraries into a single JAR file.