// enums/CarWash.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

public class CarWash {

public enum Cycle {

UNDERBODY {

@Override void action() {

System.out.println("Spraying the underbody");

}

},

WHEELWASH {

@Override void action() {

System.out.println("Washing the wheels");

}

},

PREWASH {

@Override void action() {

System.out.println("Loosening the dirt");

}

},

BASIC {

@Override void action() {

System.out.println("The basic wash");

}

},

HOTWAX {

@Override void action() {

System.out.println("Applying hot wax");

}

},

RINSE {

@Override void action() {

System.out.println("Rinsing");

}

},

BLOWDRY {

@Override void action() {

System.out.println("Blowing dry");

}

};

abstract void action();

}

EnumSet<Cycle> cycles =

EnumSet.of(Cycle.BASIC, Cycle.RINSE);

public void add(Cycle cycle) {

cycles.add(cycle);

}

public void washCar() {

for(Cycle c : cycles)

c.action();

}

@Override public String toString() {

return cycles.toString();

}

public static void main(String[] args) {

CarWash wash = new CarWash();

System.out.println(wash);

wash.washCar();

// Order of addition is unimportant:

wash.add(Cycle.BLOWDRY);

wash.add(Cycle.BLOWDRY); // Duplicates ignored

wash.add(Cycle.RINSE);

wash.add(Cycle.HOTWAX);

System.out.println(wash);

wash.washCar();

}

}

/* Output:

[BASIC, RINSE]

The basic wash

Rinsing

[BASIC, HOTWAX, RINSE, BLOWDRY]

The basic wash

Applying hot wax

Rinsing

Blowing dry

*/