TimeZone validation in Java

Question

I have a string, I need to check whether it is a standard time zone identifier or not. I am not sure which method I need to use.

String timeZoneToCheck = \"UTC\"         


        

Answer 1

You can write it in one line

public boolean validTimeZone(String timezone) {
    return Set.of(TimeZone.getAvailableIDs()).contains(timezone);
}

Alternatively, you can make a static field for it

private static final Set TIMEZONES = Set.of(TimeZone.getAvailableIDs())

public boolean validTimeZone(String timezone) {
    return TIMEZONES.contains(timezone);
}