java.lang.Enum.ordinal() 方法返回列舉常量的序數(它在列舉宣告，其中初始常量分配的零序位)。

【例項】

package com.yiibai;

import java.lang.*;
 
// enum showing Mobile prices
enum Mobile {
   Samsung(400), Nokia(250),Motorola(325);
  
   int price;
   Mobile(int p) {
      price = p;
   }
   int showPrice() {
      return price;
   } 
}

public class EnumDemo {

   public static void main(String args[]) {

     System.out.println("CellPhone List:");
     for(Mobile m : Mobile.values()) {
        System.out.println(m + " costs " + m.showPrice() + " dollars");
     }

     Mobile ret = Mobile.Samsung;
     System.out.println("The ordinal is = " + ret.ordinal());
     System.out.println("MobileName = " + ret.name());                      
   }
}
 

CellPhone List:
Samsung costs 400 dollars
Nokia costs 250 dollars
Motorola costs 325 dollars
The ordinal is = 0
MobileName = Samsung