Java Reference
In-Depth Information
Table 5-2. DecimalFormat pattern characters
Character
Meaning
Numeric digit (leading zeros suppressed)
#
Numeric digit (leading zeros provided)
0
.
Locale-specific decimal separator (decimal point)
,
Locale-specific grouping separator (comma in English)
Locale-specific negative indicator (minus sign)
-
Shows the value as a percentage
%
Separates two formats: the first for positive and the second for negative values
;
'
Escapes one of the above characters so it appears
Anything else Appears as itself
The
NumFormatDemo
program uses one
DecimalFormat
to print a number with only two
decimal places and a second to format the number according to the default locale:
/** A number to format */
public
public static
double
intlNumber
=
1024.25
;
/** Another number to format */
public
static final
final
double
public static
static final
final
double
double
ourNumber
=
100.2345678
;
NumberFormat defForm
=
NumberFormat
.
getInstance
();
NumberFormat ourForm
=
new
new
DecimalFormat
(
"##0.##"
);
// toPattern() will reveal the combination of #0., etc
// that this particular Locale uses to format with!
System
.
out
.
println
(
"defForm's pattern is "
+
((
DecimalFormat
)
defForm
).
toPattern
());
System
.
out
.
println
(
intlNumber
+
" formats as "
+
defForm
.
format
(
intlNumber
));
System
.
out
.
println
(
ourNumber
+
" formats as "
+
ourForm
.
format
(
ourNumber
));
System
.
out
.
println
(
ourNumber
+
" formats as "
+
defForm
.
format
(
ourNumber
) +
" using the default format"
);
