This gist demonstrates, how to set/replace default enum properties at runtime.

EnumWithPropertiesExample.java

// this code was tested using java ide from tutorials point
// see the running code on http://goo.gl/nhXzCc

public class EnumWithPropertiesExample{

     public static void main(String []args){
        System.out.println("All car prices:");
        for (Car c : Car.values()){
            System.out.println(c + " costs " + c.getPrice() + " thousand dollars.");
        }
        System.out.println("--------");
        Car enumObj = Car.lamborghini;
        enumObj.setPrice(21);
        System.out.println(enumObj + " costs " + enumObj.getPrice() + " thousand dollars.");
    }
}
enum Car {
   lamborghini(800),tata(2),audi(50),fiat(15),honda(12);
   private int price;
   Car(int p) {
      price = p;
   }
   void setPrice(int val){
       this.price=val;
   }
   int getPrice() {
      return price;
   } 
}