Console Input and Output - Absolute Java - page 69

Display 2.3 Currency Format (part 2 of 2)

Sample Dialogue

Without formatting:
19.8
19.81111
19.89999
19

Default location:
$19.80
$19.81
$19.90
$19.00

This assumes that the system is set to
use U.S. as the default location. If you are
not in the U.S., you will probably get the
format for your local currency.

US as location:
$19.80
$19.81
$19.90
$19.00

This should give you the format for U.S.
currency no matter what country has been
set as the default location.

returns the String value "$19.80" , assuming the default currency is the U.S. dollar. In
Display 2.3, this method invocation occurs inside a System.out.println statement,
but it is legal anyplace a String value is legal. For example, the following would
be legal:

String moneyString = moneyFormatter.format(19.8);
In order to make the class NumberFormat available to your code, you must include
the following near the start of the file with your program:

import java.text.NumberFormat;
This is illustrated in Display 2.3 .
The method invocation NumberFormat.getCurrencyInstance() produces an
object that formats numbers according to the default location. In Display 2.3, we are
assuming the default location is the United States, and so the numbers are output as
U.S. dollars. On other systems, the default should be set to the local currency. If you
wish, you can specify the location, and hence the local currency, by giving an argument
to NumberFormat.getCurrencyInstance . For example, in Display 2.3, we used the
constant Locale.US to specify that the location is the United States. The relevant line
from Display 2.3 is repeated in what follows:

NumberFormat moneyFormatter2 =
NumberFormat.getCurrencyInstance(Locale.US);