JDK has a collection of programming tools, including javac, jar, and the archiver, which packages related class libraries into a single JAR file. 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 other components are also included.
Sample Code (In the sample subdirectory) Samples, with source code, of programming for certain Java API’s.
Source Code (In src.zip) Java programming language source files for all classes that make up the Java core API (that is, sources files for the java.*, javax.* and some org.* packages, but not for com.sun.* packages). This source code is provided for informational purposes only, to help developers learn and use the Java programming language. These files do not include platform-specific implementation code and cannot be used to rebuild the class libraries. To extract these file, use any common zip utility. Or, you may use the Jar utility in the JDK’s bin/ directory: jar xvf src.zip.