![]() 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. Runtime warnings about synchronization can also be activated, using command-line option -XX:DiagnoseSyncOnValueBasedClasses.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. New javac warnings discourage synchronization on value-based class instances. Programmers are strongly discouraged from calling the wrapper class constructors, which are now deprecated for removal. Users of the value-based classes provided by the standard libraries-notably including users of the primitive wrapper classes-should avoid relying on the identity of class instances. ![]() JEP 390: Warnings for Value-based Classes
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