Java in a Nutshell, 5th Edition

Name

javah — Native Method C Stub Generator

Synopsis

javah [ options ] classnames
               

Description

javah generates C header and source files (.h and .c files) that are used when implementing Java native methods in C. The preferred native method interface changed between Java 1.0 and Java 1.1. In Java 1.1 and earlier, javah generated files for old-style native methods. In Java 1.1, the -jni option specified that javah should generate new-style files. In Java 1.2 and later, this option is the default.

This section describes only how to use javah. A full description of how to implement Java native methods in C is beyond the scope of this book.

Options

-bootclasspath

Specifies the path to search for system classes. See javac for further discussion. Java 1.2 and later.

-classpath path

Specifies the path javah uses to look up the classes named on the command line. This option overrides any path specified by the CLASSPATH environment variable. Prior to Java 1.2, this option can specify the location of the system classes and extensions. In Java 1.2 and later, it specifies only the location of application classes. See -bootclasspath. See also java for further discussion of the classpath.

-d directory

Specifies the directory into which javah stores the files it generates. By default, it stores them in the current directory. This option cannot be used with -o.

-force

Causes javah to always write output files, even if they contain no useful content.

-help

Causes javah to display a simple usage ...