JavaSE 6 has introduced a standard way for Java applications interact with scripting languages: the Java Scripting API (JSR 223). This API provides standard interfaces in such way that a given application is able to easily change from a scripting language to another. Very neat stuff!
If you want to run Groovy Dice scripts with Java Scripting API, you'll need to place the Groovy engine JAR (and the Groovy JARs as well) in your CLASSPATH.
Then, you just need to create a ScriptEngine object in your code, which can be used to evaluate Groovy Dice scripts:
import javax.script.*;
import net.sf.groovydice.*;
public class MyDiceRollerApp {
static final ScriptEngine engine;
static {
new GroovyDice().initialize();
engine = new ScriptEngineManager().getEngineByName("groovy");
}
public static void main(String[] args) {
try {
System.out.println(engine.eval("5.d10 * -8"));
}
catch (ScriptException exc) {
exc.printStackTrace();
}
}
}
For more information, please read this article on Java Scripting API.