import java.util.Calendar;
import java.util.TimeZone;
public class MyClass {
public static void main(String args[]) {
Calendar calendar = Calendar.getInstance();
String tz_name = calendar.getTimeZone().getDisplayName();
System.out.println(calendar.getTimeZone().getDisplayName());
TimeZone timezone = TimeZone.getTimeZone("Pacific/Wallis");
calendar.setTimeZone(timezone);
System.out.println(calendar.getTimeZone().getDisplayName());
}
}
/*
run:
Greenwich Mean Time
Wallis & Futuna Time
*/