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package com.ceac.deng;public class T13Enum {	public static void main(String[] args) {		// TODO Auto-generated method stub		WeekDay todDay = WeekDay.SAT;				System.out.println(todDay + "的下一天是" + todDay.nextDay());	}}class WeekDay{	public final static WeekDay SUN = new WeekDay();	public final static WeekDay MON = new WeekDay();	public final static WeekDay TUE = new WeekDay();	public final static WeekDay WED = new WeekDay();	public final static WeekDay THU = new WeekDay();	public final static WeekDay FRI = new WeekDay();	public final static WeekDay SAT = new WeekDay();		private WeekDay()	{	}		public WeekDay nextDay()	{		if (this == SUN)		{			return MON;		}		else if (this == MON)		{			return TUE;		}		else if (this == TUE)		{			return WED;		}		else if (this == WED)		{			return THU;		}		else if (this == THU)		{			return FRI;		}		else if (this == FRI)		{			return SAT;		}		else 		{			return SUN;		}			}		public String toString()	{		if (this == SUN)		{			return "星期天";		}		else if (this == MON)		{			return "星期一";		}		else if (this == TUE)		{			return "星期二";		}		else if (this == WED)		{			return "星期三";		}		else if (this == THU)		{			return "星期四";		}		else if (this == FRI)		{			return "星期五";		}		else 		{			return "星期六";		}				}	}

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