ADDITIONAL SYSTEM INFORMATION :
MacOs 10.14 / Jdk 10.0.2

A DESCRIPTION OF THE PROBLEM :
When getting the DecimalFormat for Locale NO, and some others, then ((DecimalFormat) NumberFormat.getNumberInstance(new Locale("no"))).getNegativePrefix() returns Unicode Character 'MINUS SIGN' (U+2212). While most other Locale use Unicode Character 'HYPHEN-MINUS' (U+002D).

REGRESSION : Last worked in version 8u191

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
 public void norwegianNegativePrefixWrong() throws UnsupportedEncodingException {
        String norwegianNegativePrefix = ((DecimalFormat) NumberFormat.getNumberInstance(new Locale("no"))).getNegativePrefix();
        String englishNegativePrefix = ((DecimalFormat) NumberFormat.getNumberInstance(new Locale("en"))).getNegativePrefix();
        if (norwegianNegativePrefix.equals(englishNegativePrefix)) {
            System.out.println("Negative prefix is similar");
        } else {
            System.out.println("Negative prefix is not similar");
        }
    }

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Negative prefix is similar
ACTUAL -
Negative prefix is not similar

CUSTOMER SUBMITTED WORKAROUND :
After getting DeicmalFormat you can manually set negative prefix, i.e.

DecimalFormat df = ((DecimalFormat) NumberFormat.getNumberInstance(new Locale("no")));
df.setNegativePrefix("-");

FREQUENCY : always