Format a number with leading sign

Question

How do I format in Java a number with its leading sign?

Negative numbers are correctly displayed with leading -, but obviously positive numbers are not

Answer 1

Use a negative subpattern, as described in the javadoc for DecimalFormat.

DecimalFormat fmt = new DecimalFormat("+#,##0.00;-#");
System.out.println(fmt.format(98787654.897));
System.out.println(fmt.format(-98787654.897));

produces (in my French locale where space is the grouping separator and the comma is the decimal separator) :

+98 787 654,90
-98 787 654,90