问题
I'm creating an user interface using GWT and there're many boxes of double values but when I set some variable which contains more than 3 decimal places my DoubleBox doesn't accept and truncates the number letting just 3 places.
Is it normal?
What's the best solution?
Thank you.
回答1:
As the javadoc says DoubleBox is a ValueBox using a DoubleParser and DoubleRenderer. Those rely on NumberFormat.getDecimalFormat() which will trunk at 3 decimals in most (if not all) locales (for the default locale: http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/i18n/client/constants/NumberConstantsImpl.properties)
If you want another format, then use a ValueBox with a NumberFormatRenderer with your custom NumberFormat pattern (and either use the DoubleParser or make your own Parser with your custom NumberFormat pattern)
来源：https://stackoverflow.com/questions/12245622/gwt-doublebox-with-more-than-3-decimal-places