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A Java application is a Java class with a special method
(whose name is main
). The application can be invoked directly
by naming it in the Java command.
If you want to generate an application from a Scheme program,
create a Scheme source file with the definitions you need, plus
the top-level actions that you want the application to execute.
For example, assuming your Scheme file is
MyProgram.scm
, you have two ways at your disposal to
compile this Scheme program to a standalone application:
--main
option.
kawa --main -C MyProgram.scm
The --main
option will compile all Scheme programs
received in arguments to standalone applications.
main: #t
module compile option to your module.
;; MyProgram.scm (module-name <myprogram>) (module-compile-options main: #t)
kawa -C MyProgram.scm
This way you can compile multiple Scheme programs at once, and still control which one(s) will compile to standalone application(s).
Both methods will create a MyProgram.class
which you can either
load
(as described in the previous section), or invoke as an application:
java MyProgram [args]
Your Scheme program can access the command-line arguments args by using the global variable ‘command-line-arguments’, or the R6RS function ‘command-line’.
If there is no explicit module-export
in a module compiled
with --main
then no names are exported. (The default
otherwise is for all names to be exported.)
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