JavaHead

JavaHead is designed to run Java classes easily with familiar Ruby syntax.

Installation

Add this line to your application's Gemfile:

gem 'java_head'

And then execute:

$ bundle

Or install it yourself as:

$ gem install java_head

Usage

Use the two primary JavaHead classes, Package and Class, to represent Java packages and classes, respectively. Here is some basic usage:

require 'java_head'

# JavaHead::CLASSPATH is an array of Pathnames that represent where JavaHead will search for your classes. Its initial value is created based on the CLASSPATH environment variable
# You can also change your CLASSPATH like so:
JavaHead::CLASSPATH.push(Pathname.new('/my/java/classpath'))

# Get a package, this will load the package corresponding to /my/java/classpath/com/example/foo
package = JavaHead > 'com.example.foo'


subpackage = package > 'bar'    # Pull up a subpackage
subpackage.compile              # invoke javac to compile all files in the ppackage
subpackage.remove_class         # remove .class files

jclass = subpackage > 'MyClass' # Also JavaHead > 'com.example.foo.bar.MyClass' or 'com.example.foo.bar.MyClass'.java
jclass.package == subpackage    # => true
jclass.compile                  # Compile the class, this returns the JavaHead::Class object
jclass.exec                     # Execute the compiled class, this returns the output of the execution
jclass.remove_class             # Remove the .class file
jclass.run                      # Do the same thing with only one method, this returns the same as #exec()
jclass.run('Hello','World')     # You can also pass command-line arguments to your Java programs

# NOTE: This library requires that you install the java command line tools (java and javac) in order to function. If you do not, it will fail in mysterious ways due to an inability to compile or run Java

Contributing

  1. Fork it ( https://github.com/LuminousRubyist/java_head/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request