Using Scala's Option from Java

OptionExample.java

package net.ccombs.scalaFromJava;

import scala.Option;
import scala.Some;
import scala.runtime.AbstractFunction0;

/**
 * OptionExample
 */
public class OptionExample {

    /**
     * Construct a Scala Option[T] from a given value.
     */
    private static final <T> scala.Option<T> option(final T value) {
        return (value != null)?new Some<T>(value):scala.Option.apply((T) null);
    }

    public static void main(final String args[]) {
        final Some<String> s1 = (Some<String>) option("s1");
        // this doesn't work
        // final None n = (None) option(null);
        final Option<String> n = option(null);
        
        // Compiles, even though n is Option<String>.  It works 
        // at runtime, since getOrElse returns an Integer
        Integer test = n.getOrElse(new AbstractFunction0<Integer>() {

            @Override
            public Integer apply() {
                return 4;
            } });
        
        // Compiles, but gives ClassCastException at runtime
        Integer test2 = s1.getOrElse(new AbstractFunction0<Integer>() { 

            @Override
            public Integer apply() {
                return 4;
            } });

    }
}