Java 枚举示例

原文： https://javabeginnerstutorial.com/core-java-tutorial/java-enum-example/

/**
 * @author GHajba
 *
 */
public class Main {
    public static void main(final String... args) {
        Schedule currentSchedule = new Schedule();
        currentSchedule.setWorkday(Workday.FRIDAY);
        System.out.println("--------");
        if (currentSchedule.getWorkday() == Workday.FRIDAY) {
            System.out.println("Hurray! Tomorrow is weekend!");
        }
        System.out.println("--------");
        switch (currentSchedule.getWorkday()) {
        case MONDAY:
        case TUESDAY:
        case WEDNESDAY:
        case THURSDAY:
            System.out.println("Working and working and...");
            break;
        case FRIDAY:
            System.out.println("Hurray! Tomorrow is weekend!");
            break;
        default:
            System.out.println("Unknown day -.-");
        }
        System.out.println("--------");
        System.out.println("Displaying all Workdays:");
        for (Workday w : Workday.values()) {
            System.out.println(w);
        }
        System.out.println("--------");
        System.out.println("Displaying all Workdays:");
        for (Workday w : Workday.values()) {
            System.out.println(w.getRepresentation());
        }
    }
}

Schedule.java

/**
 * @author GHajba
 *
 */
public class Schedule {
    private Workday workday;
    public Workday getWorkday() {
        return this.workday;
    }
    public void setWorkday(final Workday workday) {
        this.workday = workday;
    }
}

Workday.java

/**
 * @author GHajba
 *
 */
public enum Workday implements DatabaseEnum<Workday> {
    MONDAY("Monday"),
    TUESDAY("Tuesday"),
    WEDNESDAY("Wednesday"),
    THURSDAY("Thursday"),
    FRIDAY("Friday");
    private final String representation;
    private Workday(final String representation) {
        this.representation = representation;
    }
    public String getRepresentation() {
        return this.representation;
    }
    @Override
    public String toString() {
        return getRepresentation();
    }
    @Override
    public String toDatabaseString() {
        return this.representation;
    }
    @Override
    public Workday fromDatabase(final String representation) {
        for (Workday wd : Workday.values()) {
            if (wd.representation.equals(representation)) {
                return wd;
            }
        }
        return null;
    }
}