jdk: jdk root directory, containing copyright, license and README files as well as the source file archive (src.zip) of the Java Core Platform API.
Subdirectory of jdk:
--jdk\bin: jdk development tool executable file directory, which contains javac.exe, java.exe and other executable programs.
--jdk\lib: The class library directory used by jdk development tools, mainly including tools.jar and dt.jar.
--jdk\jre: The root directory of the Java runtime environment used by the jdk development tool. Except for the documentation, it is exactly the same as the deployable JRE.
--jdk\demo: Some examples that come with jdk, including program examples with source code.
--jdk\include: c header file, used to support the native-code library using the jvm Debugger interface.
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