Enumeration with constructor and abstract methods

Package CN. itcast. day1;

Public class Enum {
Public static void main (string [] ARGs ){
Weekday1 weekday = weekday1.sat;

System. Out. println (weekday. nextday ());


System. Out. println (weekday. Fri );
System. Out. println (weekday. Mon. Name ());
System. Out. println (weekday. Mon. ordinal ());

}

Public Enum weekday {
// Simple enumeration
Sun, Mon, Tus, wed, Thu, Fri, SAT; // you can add a; number or no

// Enumeration with Constructor

// When enumeration has a constructor, 1. The constructor must be placed behind the attribute.
// 2. The attribute must be followed by a; No.

// 3. The constructor must be private.
// Construction method without Parameters
Private weekday (){}
// Construction method with Parameters

Private weekday (INT day ){}

}


Public Enum trifficlight {
// Enumeration with abstract methods
Green (30 ){
Public trifficlight nextlight (){
Return yellow;
}
},
Red (15 ){
Public trifficlight nextlight (){
Return green;
}
},
Yellow (5 ){
Public trifficlight nextlight (){
Return red;
}
};

// The next light is

Public abstract trifficlight nextlight ();


// Define a construction method with Parameters

Private int time; // the time when each lamp is on.
Private trifficlight (INT time ){
This. Time = time;
}
}

}