带构造方法的枚举

package com.howlaa.day03;

public class EnumTest {
	public static void main(String[] args) {
		WeekDay weekday =WeekDay.FRI;
		System.out.println(weekday);
		System.out.println(weekday.name());
		System.out.println(weekday.ordinal());
		System.out.println(weekday.valueOf("SUN"));
		System.out.println(weekday.values().length);
	}
	public enum WeekDay{
		SUN(1),MON(),TUE,WED,THI,FRI,SAT;
		private WeekDay(){
			System.out.println("first");
		}
		private WeekDay(int day){
			System.out.println("second");
		}
	}
}

输出结果：

带构造方法的枚举

注意：构造方法要写在静态变量后面。构造方法要设为private。原因是如果是public，别人可以调用，也失去了枚举的意义。

在静态变量后加小括号表示要调用哪个构造方法。