JDK 12工具参考手册：Java SE Release 12官方指南 - CSDN文库

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-h directory

Specifies where to place generated native header files.

When you specify this option, a native header file is generated for each class that

contains native methods or that has one or more constants annotated with the

java.lang.annotation.Native annotation. If the class is part of a package, then

the compiler puts the native header file in a subdirectory that reflects the package

name and creates directories as needed.

--help

,

–help

or

-?

Prints a synopsis of the standard options.

--help-extra

or

-X

Prints the help for extra options.

-implicit:[none, class]

Specifies whether or not to generate class files for implicitly referenced files:

•

-implicit:class

— Automatically generates class files.

•

-implicit:none

— Suppresses class file generation.

If this option isn’t specified, then the default automatically generates class files. In this

case, the compiler issues a warning if any class files are generated when also doing

annotation processing. The warning isn’t issued when the

-implicit

option is

explicitly set. See Searching for Types.

-Joption

Passes

option

to the runtime system, where

option

is one of the Java options

described on javacommand. For example,

-J-Xms48m

sets the startup memory to 48

MB.

Note:

The

CLASSPATH

environment variable,

-classpath

option,

-bootclasspath

option, and

-extdirs

option don’t specify the classes used to run

javac

.

Trying to customize the compiler implementation with these options and

variables is risky and often doesn’t accomplish what you want. If you must

customize the complier implementation, then use the

-J

option to pass

options through to the underlying Java launcher.

--limit-modules module,module

*

Limits the universe of observable modules.

--module module-name

or

-m module-name

Compiles only the specified module and checks time stamps.

--module-path path

or

-p path

Specifies where to find application modules.

--module-source-path module-source-path

Specifies where to find input source files for multiple modules.

--module-version version

Specifies the version of modules that are being compiled.

Chapter 2

javac

2-6

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