javah
javah produces C header files and C source files from
a Java class.
SYNOPSIS
javah [ options ] classname. . .
javah_g [ options ] classname. . .
DESCRIPTION
javah generates C header and source files that are needed to
implement native methods. The generated header and source files
are used by C programs to reference class instance variables from
native source code. The .h file contains a struct definition whose
layout parallels the layout of the corresponding class. The fields
in the struct correspond to instance variables in the class.
The name of the header file and the structure declared within it are
derived from the name of the class. If the class passed to javah is
inside a package, the package name is prepended to both the header file name
and the structure name. Underscores (_) are used as name delimiters.
By default javah creates a header file for each class listed
on the command line and puts the files in the current directory.
Use the -stubs option to create source files.
Use the -o option to concatenate the results for all listed classes
into a single file.
javah_g is a non-optimized version of javah suitable for use with
debuggers like dbx or gdb.
OPTIONS
- -o outputfile
- Concatenates the resulting header or source files for all the
classes listed on the command line into outputfile.
- -d directory
- Sets the directory where javah saves the header files
or the stub files.
- -td directory
- Overrides the default directory where javah stores temporary files.
The default is /tmp.
- -stubs
- Causes javah to generate C declarations from the Java
object file.
- -verbose
- Causes javah to print a message to stdout concerning the status of
the generated files.
- -classpath path
- Specifies the path javah uses to look up classes. Overrides the default
or the CLASSPATH environment variable if it is set. Directories are separated by
colons. Thus the general format for path is:
.:<your_path>
For example:
.:/home/avh/classes:/usr/local/java/classes
ENVIRONMENT VARIABLES
- CLASSPATH
- Used to provide the system a path to user-defined classes. Directories are
separated by colons, for example,
.:/home/avh/classes:/usr/local/java/classes
SEE ALSO
java, javac,
javaprof, javap,
javadoc
The Java Language
Specification, The JAVA Virtual
Machine Specification