A DESCRIPTION OF THE PROBLEM :
In Java 1.7 and 1.8 the minug sign was - (\u002d, ascii hex 2D ), but with Java 11 and up it is \u2212.

REGRESSION : Last worked in version 8

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
            DecimalFormat df = new DecimalFormat("#0.00");
            Locale locale = Locale.forLanguageTag("sl-SI");
            System.out.println("locale = " + locale);
            DecimalFormatSymbols ddd = new DecimalFormatSymbols(locale);
            df.setDecimalFormatSymbols(ddd);
            String negativePrefix = df.getNegativePrefix();
            System.out.println("minus = " + (int) negativePrefix.charAt(0));

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
locale = sl_SI
minus = 45
ACTUAL -
locale = sl_SI
minus = 8722

CUSTOMER SUBMITTED WORKAROUND :
Use setMinusSign on DecimalFormatSymbols.

FREQUENCY : always