定义枚举类型Weekday，使用枚举类型配合switch语句，尝试如下功能：
wd = Mon是输出“Do Monday work”，wd = Tue时，输出“Do Monday work”，以此类推，当wd不为枚举值元素值时输出“I don`t know which is day”。
实现代码如下：
package workspace; enum Weekday{Mon,Tue,Wed,Thu,Fri,Sat,Sun}; public class myday { public static void main(String[] args) { Weekday c1 = Weekday.Mon; switch (c1) { case Mon: { System.out.println("Do Monday work"); break; } case Tue: { System.out.println("Do Tuesday work"); break; } case Wed: { System.out.println("Do Wednessday work"); break; } case Thu:{ System.out.println("Do Thursday work"); } case Fri:{ System.out.println("Do Friday work"); } case Sat:{ System.out.println("Do Saturday work"); } case Sun:{ System.out.println("Do Sunday work"); } default:{ System.out.println("I don`t know which is day"); } } } }输出：
Do Monday work
