public enum Car
{
        NANO ("Very Cheap", "India"),
        MERCEDES ("Expensive", "Germany"),
        FERRARI ("Very Expensive", "Italy");

        public final String cost;
        public final String madeIn;

        Car(String cost, String madeIn)
        {
                this.cost= cost;
                this.madeIn= madeIn;
        }

}

public enum Car
{
    NANO,
    MERCEDES,
    FERRARI;

    public final String cost;
    public final String madeIn;

    Car()
    {
            this.cost = BUNDLE.getString("Car." + name() + ".cost");
            this.madeIn = BUNDLE.getString("Car." + name() + ".madeIn");
    }

    private static final ResourceBundle BUNDLE = ResourceBundle.getBundle(...);

}

Car.NANO.cost=Very cheap
Car.NANO.madeIn=India
Car.MERCEDES.cost=Expensive
...

<bean id="car" class="Foo">
    <property name="carString" value="NANO" />
</bean>

public void setCar(String carString) {
    this.carString = Car.valueOf(carString);
}

Constructor con = MyEnum.class.getDeclaredConstructors()[0];
Method[] methods = con.getClass().getDeclaredMethods();
for (Method m : methods) {
  if (m.getName().equals("acquireConstructorAccessor")) {
    m.setAccessible(true);
    m.invoke(con, new Object[0]);
  }
}
Field[] fields = con.getClass().getDeclaredFields();
Object ca = null;
for (Field f : fields) {
  if (f.getName().equals("constructorAccessor")) {
    f.setAccessible(true);
    ca = f.get(con);
  }
}
Method m = ca.getClass().getMethod(
  "newInstance", new Class[] { Object[].class });
m.setAccessible(true);
MyEnum v = (MyEnum) m.invoke(ca, new Object[] {
  new Object[] { "MY_NEW_ENUM_VALUE", Integer.MAX_VALUE } });
  System.out.println(v.getClass() + ":" + v.name() + ":" + v.ordinal());

public enum Car {
    NANO(CarEnumerationInitializer.getNANO()), MERCEDES(
    		CarEnumerationInitializer.getMERCEDES()), FERRARI(
    		CarEnumerationInitializer.getFERRARI());

    public final String cost;
    public final String madeIn;

    Car(ICarProperties properties) {
    	this.cost = properties.getCost();
    	this.madeIn = properties.getMadeIn();
    }
}

//Car's properties placeholder interface ...
public interface ICarProperties {
    public String getMadeIn();
    public String getCost();
}
//... and its implementation
public class CarProperties implements ICarProperties {
    public final String cost;
    public final String madeIn;

    public CarProperties(String cost, String madeIn) {
    	this.cost = cost;
    	this.madeIn = madeIn;
    }
    @Override
    public String getCost() {
    	return this.cost;
    }
    @Override
    public String getMadeIn() {
    	return this.madeIn;
    }
}

//Singleton that will be provide Car's properties, that will be defined at applicationContext loading.
public final class CarEnumerationInitializer {
    private static CarEnumerationInitializer INSTANCE;
    private static ICarProperties NANO;
    private static ICarProperties MERCEDES;
    private static ICarProperties FERRARI;

    private CarEnumerationInitializer(ICarProperties nano,
    		ICarProperties mercedes, ICarProperties ferrari) {
    	CarEnumerationInitializer.NANO = nano;
    	CarEnumerationInitializer.MERCEDES = mercedes;
    	CarEnumerationInitializer.FERRARI = ferrari;
    }

    public static void forbidInvocationOnUnsetInitializer() {
    	if (CarEnumerationInitializer.INSTANCE == null) {
    		throw new IllegalStateException(CarEnumerationInitializer.class
    				.getName()
    				+ " unset.");
    	}
    }

    public static CarEnumerationInitializer build(CarProperties nano,
    		CarProperties mercedes, CarProperties ferrari) {
    	if (CarEnumerationInitializer.INSTANCE == null) {
    		CarEnumerationInitializer.INSTANCE = new CarEnumerationInitializer(
    				nano, mercedes, ferrari);
    	}
    	return CarEnumerationInitializer.INSTANCE;
    }

    public static ICarProperties getNANO() {
            forbidInvocationOnUnsetInitializer();
    	return NANO;
    }

    public static ICarProperties getMERCEDES() {
            forbidInvocationOnUnsetInitializer();
    	return MERCEDES;
    }

    public static ICarProperties getFERRARI() {
            forbidInvocationOnUnsetInitializer();
    	return FERRARI;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans>
    <bean id="nano" class="be.vinkolat.poc.core.car.CarProperties">
    	<constructor-arg type="java.lang.String" value="Cheap"></constructor-arg>
    	<constructor-arg type="java.lang.String" value="India"></constructor-arg>
    </bean>
    <bean id="mercedes"
    	class="be.vinkolat.poc.core.car.CarProperties">
    	<constructor-arg type="java.lang.String" value="Expensive"></constructor-arg>
    	<constructor-arg type="java.lang.String" value="Germany"></constructor-arg>
    </bean>
    <bean id="ferrari" class="be.vinkolat.poc.core.car.CarProperties">
    	<constructor-arg type="java.lang.String"
    		value="Very Expensive">
    	</constructor-arg>
    	<constructor-arg type="java.lang.String" value="Italy"></constructor-arg>
    </bean>
    <bean id="carInitializer"
    	class="be.vinkolat.poc.core.car.CarEnumerationInitializer"
    	factory-method="build" lazy-init="false">
    	<constructor-arg type="be.vinkolat.poc.core.car.CarProperties"
    		ref="nano" />
    	<constructor-arg type="be.vinkolat.poc.core.car.CarProperties"
    		ref="mercedes" />
    	<constructor-arg type="be.vinkolat.poc.core.car.CarProperties"
    		ref="ferrari" />
    </bean>
</beans>