带构造函数的枚举

今天学习Java觉得带构造函数的枚举挺有意思的！代码如下：

package com.jemsn.weekday;public class test {public static void main(String[] args) {weekday mon = weekday.mon;weekday tue = weekday.tue;weekday thus = weekday.thus;weekday fri = weekday.fri;}public enum weekday {mon(), tue(2), wes(3), thus(), fri;private weekday() {System.out.println("no args");}private weekday(int i) {System.out.println("have args " + i);};}}

输出的结果如下：

---------------------------------------------------------------------------------------

no args
have args 2
have args 3
no args
no args

--------------------------------------------------------------------------------------

所以今天终于明白原来枚举就像类一样，可以有构造函数！并且上述枚举里的fri本身就是一个weekday对象！就像我们自己写的fri=new weekday()一样！

mon()就是执行不带参数的构造函数！