枚举星期

public class EnumWeek {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
//		Weekday1 weekday=Weekday1.MON.NextDay();
//		System.out.println(weekday);
		
		WeekDay weekday2=WeekDay.TUE;
		weekday2.name();
		System.out.println(weekday2);
		System.out.println(WeekDay.valueOf("SUN"));
		System.out.println(WeekDay.values().length);
		TrafficLamp[] lamps=TrafficLamp.values();
		System.out.println(lamps[0].name());
		
	}
	public enum WeekDay{
		SUN(1),MON(),TUE,WED,TUR,FRI,SAT;
		private WeekDay(){
			System.out.println("first");
		}
		private WeekDay(int num){
			System.out.println("second");
		}
	}
	public enum TrafficLamp{
		red(45){

			@Override
			public TrafficLamp nextLamp() {
				return green;
			}
			
		},
		green(30){

			@Override
			public TrafficLamp nextLamp() {
				return yellow;
			}
			
		},
		yellow(5){

			@Override
			public TrafficLamp nextLamp() {
				return red;
			}
			
		};
		private int time;
		private TrafficLamp(int time){this.time=time;}
		public abstract TrafficLamp nextLamp();
	}
}