public static void main(String[] args) {
Set<Watercolors> set1 = EnumSet.range(BRILLIANT_RED, VIRIDIAN_HUE);
Set<Watercolors> set2 = EnumSet.range(CERULEAN_BLUE_HUE, BURNT_UMBER);
print("set1: " + set1);
print("set2: " + set2);
print("union(set1, set2): " + union(set1, set2));
Set<Watercolors> subset = intersection(set1, set2);
print("intersection(set1, set2): " + subset);
print("difference(set1, subset): " + difference(set1, subset));
print("difference(set2, subset): " + difference(set2, subset));
print("complement(set1, set2): " + complement(set1, set2));
}
public String toString() {
return cycles.toString();
}
private void add(Cycle cycle) {
cycles.add(cycle);
}
public class CarWash {
/** 常量相关方法，比匿名内部类更高效 */
public void wash() {
CarWash wash = new CarWash();
print(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);
print(wash);
wash.washCar();
}
public enum Cycle {
UNDERBODY {
void action() {
print("Spraying the underbody");
}
},
WHEELWASH {
void action() {
print("Washing the wheels");
}
},
PREWASH {
void action() {
print("Loosening the dirt");
}
},
BASIC {
void action() {
print("The basic wash");
}
},
HOTWAX {
void action() {
print("Applying hot wax");
}
},
RINSE {
void action() {
print("Rinsing");
}
},
BLOWDRY {
void action() {
print("Blowing dry");
}
};
abstract void action();
}
EnumSet<Cycle> cycles = EnumSet.of(Cycle.BASIC, Cycle.RINSE);
private void add(Cycle cycle) {
cycles.add(cycle);
}
private void washCar() {
for (Cycle c : cycles) c.action();
}
public String toString() {
return cycles.toString();
}
} /*