converting timezone to 3 characters ZoneId

Question

I want to convert TimeZone such as \"America/Chicago\" to \"CST\". I can make use of SHORT_IDS map of ZoneID class. However, there are limited number of timezones configured in

Answer 1

Use TimeZone.getDisplayName:

TimeZone.getTimeZone("America/Chicago").getDisplayName(false, TimeZone.SHORT)

Ideone demo

But be very careful about using three-letter time zone identifiers. Only use them for display (as implied by the method name); do not use them to identify a time zone otherwise.