Chance.js Java integration is quite easy

App.java

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Random;
import java.util.function.Supplier;

public class App 
{
    public static void main( String[] args ) throws ScriptException, NoSuchMethodException {
        ScriptEngineManager engineManager = new ScriptEngineManager();
        ScriptEngine engine = engineManager.getEngineByName("nashorn");
        // Create a source for random numbers, as the built-in mersene twister suffers some problems
        final Random random = new Random();
        engine.put("generator", (Supplier<Object>) random::nextDouble);
        
        // Add a global object, so we can get a reference to chance
        final Object exports = engine.eval("exports = {}");
        
        // Read chance.js from the classpath
        final InputStreamReader reader = new InputStreamReader(App.class.getClassLoader().getResourceAsStream("chance.js"););
        // Execute chance.js
        engine.eval(reader);
        
        // Get a usable interface to chance.js
        final Object chance = engine.eval("new exports.Chance(function(){ return generator.get(); })");
        Invocable invocable = (Invocable) engine;
        final Chance anInterface = invocable.getInterface(chance, Chance.class);

        // Try using the interface        
        System.out.println(anInterface.bool());
        System.out.println(anInterface.floating());
        System.out.println(anInterface.character());
        System.out.println(anInterface.integer());
        System.out.println(anInterface.natural());
        System.out.println(anInterface.string());
        System.out.println(anInterface.sentence());
        System.out.println(anInterface.paragraph());
        System.out.println(anInterface.syllable());
        System.out.println(anInterface.word());
        System.out.println(anInterface.age());
        System.out.println(anInterface.birthday());
        System.out.println(anInterface.cpf());
        System.out.println(anInterface.first());
        System.out.println(anInterface.last());
        System.out.println(anInterface.name());
        System.out.println(anInterface.gender());
        System.out.println(anInterface.color());
        System.out.println(anInterface.domain());
        System.out.println(anInterface.email());
        System.out.println(anInterface.fbid());
        System.out.println(anInterface.google_analytics());
        System.out.println(anInterface.hashtag());
        System.out.println(anInterface.ip());
        System.out.println(anInterface.ipv6());
        System.out.println(anInterface.klout());
        System.out.println(anInterface.tld());
        System.out.println(anInterface.twitter());
        System.out.println(anInterface.url());
        System.out.println(anInterface.address());
        System.out.println(anInterface.altitude());
        System.out.println(anInterface.areacode());
        System.out.println(anInterface.city());
        System.out.println(anInterface.coordinates());
        System.out.println(anInterface.country());
        System.out.println(anInterface.depth());
        System.out.println(anInterface.geohash());
        System.out.println(anInterface.latitude());
        System.out.println(anInterface.longitude());
        System.out.println(anInterface.phone());
        System.out.println(anInterface.postal());
        System.out.println(anInterface.province());
        System.out.println(anInterface.state());
        System.out.println(anInterface.street());
        System.out.println(anInterface.zip());
        System.out.println(anInterface.ampm());
        System.out.println(anInterface.date());
        System.out.println(anInterface.hammertime());
        System.out.println(anInterface.hour());
        System.out.println(anInterface.millisecond());
        System.out.println(anInterface.minute());
        System.out.println(anInterface.month());
        System.out.println(anInterface.second());
        System.out.println(anInterface.timestamp());
        System.out.println(anInterface.year());
        System.out.println(anInterface.cc());
        System.out.println(anInterface.cc_type());
        System.out.println(anInterface.currency());
        System.out.println(anInterface.currency_pair());
        System.out.println(anInterface.dollar());
        System.out.println(anInterface.exp());
        System.out.println(anInterface.exp_month());
        System.out.println(anInterface.exp_year());
        System.out.println(anInterface.prefix());
        System.out.println(anInterface.ssn());
        System.out.println(anInterface.suffix());
        System.out.println(anInterface.android_id());
        System.out.println(anInterface.apple_token());
        System.out.println(anInterface.bb_pin());
        System.out.println(anInterface.wp7_anid());
        //System.out.println(anInterface.wp8_anid2()); needs base64 encoder

    }
}

Chance.java

import jdk.nashorn.internal.objects.NativeDate;

public interface Chance {

    // Basic
    public Boolean bool();
    public String character();
    public Double floating();
    public Long integer();
    public Long natural();
    public String string();

    // Text
    public String paragraph();
    public String sentence();
    public String syllable();
    public String word();

    // Person
    public Integer age();
    public NativeDate birthday();
    public String cpf(); // Brazilian Tax ID
    public String first();
    public String gender();
    public String last();
    public String name();
    public String prefix();
    public String ssn(); // Social Security Number
    public String suffix();

    // Mobile
    public String android_id();
    public String apple_token();
    public String bb_pin();
    public String wp7_anid();
    // Needs base64 encoder
    // public String wp8_anid2();

    // Web
    public String color();
    public String domain();
    public String email();
    public String fbid();
    public String google_analytics();
    public String hashtag();
    public String ip();
    public String ipv6();
    public String klout();
    public String tld();
    public String twitter();
    public String url();

    // Location
    public String address();
    public String altitude();
    public String areacode();
    public String city();
    public String coordinates();
    public String country();
    public String depth();
    public String geohash();
    public String latitude();
    public String longitude();
    public String phone();
    public String postal();
    public String province();
    public String state();
    public String street();
    public String zip();

    // Time
    public String ampm();
    public String date();
    public String hammertime();
    public String hour();
    public String millisecond();
    public String minute();
    public String month();
    public String second();
    public String timestamp();
    public String year();

    // Finance
    public String cc();
    public String cc_type();
    public String currency();
    public String currency_pair();
    public String dollar();
    public String exp();
    public String exp_month();
    public String exp_year();

    // Misc
    public String guid();
    public String hash();
    public String radio();
    public String tv();

}

This is super cool, had no idea this was possible!

I am clearly not a Java programmer 😜

brilliant, really. @treo