package cn.itcast;

import java.util.Date;

public class EnumTest {
 public static void main(String[] args) {
  WeekDay weekday1 =  WeekDay.MON;
  //System.out.println(weekday1.nextDay());
  
  //System.out.println(weekday);
  
  WeekDay weekDay2 = WeekDay.FRI;
  System.out.println(weekDay2);
  System.out.println(weekDay2.name());
  System.out.println(weekDay2.ordinal());
  System.out.println(WeekDay.valueOf("SUN").toString());
  System.out.println(WeekDay.values().length);
  
  new Date(300){};
 }
 
 public enum WeekDay{
  //構造方法必須寫在列舉元素之後
  //如果在列舉元素之後沒有寫括號，預設呼叫的是無參構造
  //列舉的構造方法必須是private型別的
  //如果在列舉元素之後帶括號，這時呼叫的是有參構造。
  SUN(),MON(),TUE(),WED,THT,FRI,SAT;
  private WeekDay(){
   System.out.println("first");
  }
  
  private WeekDay(int day){
   System.out.println("second");
  }
 }
 
 public enum TrafiicLamp{
  RED(30) {
   public TrafiicLamp nextLamp() {
    return GREEN;
   }
  },
  GREEN(45) {
   public TrafiicLamp nextLamp() {
    return YELLOW;
   } 
  },
  YELLOW(5) {
   public TrafiicLamp nextLamp() {
    return RED;
   }
  };
  public abstract TrafiicLamp nextLamp();
  private int time;
  private TrafiicLamp(int time){
   this.time = time;
  }
 }
}