Description Werner Keil 2011-02-27 10:02:32 EST

Time units like SI.SECOND and all derived types of Unit<Time> should be related or a sub-class of ICU's
com.ibm.icu.util.TimeUnit. Similar to UOMo Business CurrencyUnit extending ICU Currency, also a subclass of com.ibm.icu.util.MeasureUnit.
Unfortunately unlike Currency TimeUnit contains a private constructor:
    private TimeUnit(String name) {
        this.name = name;
        values[valueCount++] = this; // store in values array
    }

Making this class effectively final without a final modifier. 

Adding further inconsistency within ICU4J and confusion for adopters, there is a second in this case final class com.ibm.icu.impl.duration.TimeUnit, which is NOT a subclass of MeasureUnit and defines almost identical elements like SECOND, MINUTE, HOUR,... 

This is therefore an ICU4J issue or bug which will if possible be raised there, too.