Elaborato_IS/Elaborato_IS/src/Calendar/ActivityType.java

package Calendar;

import java.util.TreeSet;

public enum ActivityType {
	Empty,
	Retrieve,
	FirstRelease,
	Renew,
	Shipment,
	Lost,
	Ruined;
	public static TreeSet<ActivityType> Names () {
		TreeSet<ActivityType> TMP = new TreeSet<>();
		for (var name: ActivityType.values()) {
			TMP.add(name);
		}
		return TMP;
	}
}