用enum定義枚舉類型，即定義一些常量。
public enum Weekday{
SUNDAY,MONDAY,TUESDAY,WEDNESDAY, THURSDAY,FRIDAY,SATURDAY }


定義一個變量：
Weekday day=Weekday.MONDAY;

Java中enum語法不太嚴謹，代替方法用public static final來定義常量

代碼如下：

HelloWorld.java

package my;public class HelloWorld {public static void main(String[] args){ Weekday day=Weekday.MONDAY;if(day==Weekday.MONDAY) System.out.println("Today is monday");if(day==Weekday.SUNDAY) System.out.println("Today is sunday");switch(day) {case SUNDAY:case SATURDAY:System.out.println("go to bed, have a nice dream!");break;default:System.out.println("go to work");break; }//enum->StringSystem.out.println("the day is "+day.toString());//String->enumtry {Weekday otherDay=Weekday.valueOf("TUESDAY");System.out.println("convert success! other day is "+otherDay);}catch(IllegalArgumentException e) {System.out.println("covert failed");}//enum->intint index=day.ordinal();//int->enumWeekday[] options=Weekday.values();for(Weekday d:Weekday.values())System.out.print(d+", ");} }
Weekday.java

package my;public enum Weekday {SUNDAY,MONDAY,TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY }
運行結果如下：

總結

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