Enumeration基础

//Enumberation Fundamentals// method/* *public static enum-type [] values();//returns an array *public static enum-type valueof(String str);//returns enumeration constant */enum Apple {   Jonathan, GoldenDel, RedDel, Winesap, Cortland}class EnumDemo {   public static void main(String args []) {      Apple ap;      ap= Apple.RedDel;      System.out.println("Value of ap: "+ ap);      System.out.println();      ap= Apple.GoldenDel;      if(ap == Apple.GoldenDel)         System.out.println("ap contains GoldenDel.\n");      //      switch(ap) {         case Jonathan:            System.out.println("Jonathan is red.");            break;         case GoldenDel:            System.out.println("Golden Delicious is yellow.");            break;         case RedDel:            System.out.println("reddel is red.");         case Winesap:            System.out.println("Winesap is red.");         case Cortland:            System.out.println("Cortland is red.");      }      Apple allapples[]= Apple.values();      for(Apple a: allapples)         System.out.println(a);      System.out.println();      ap= Apple.valueOf("Winesap");      System.out.println("ap contains "+ ap);   }}