Java Enum.valueOf() efficiency when value does not exist

Question

Which would you consider more efficient?

The use of \'WeekDay\' is just an example:

public enum WeekDay {
    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDA         


        

Answer 1

Or you could create a lookup of enum values inside your enum when the class first loads(see static modifier) and validate using get() as shown below:

private String dayName;
private static final Map lookup = new HashMap();
static{
    for (Weekday day: values()){
        lookup.put(day.dayName, d);
    }
}
public static Weekday get(String _name){
    return lookup.get(_name);
}

Let me know if you need more details