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Tip of the Day
Language: Java
Expertise: Intermediate
Mar 10, 1999

Internationalizing Currency Value Displays

As with dates, different countries and regions use different symbols and formats when displaying currency values. Java 1.1 provides a simple facility for displaying a currency value in a manner appropriate to the user's locale. To do so, call the static getCurrencyInstance() method in the java.text.NumberFormat class and use the object reference returned to format the currency value:
 
Double amount = new Double(12345678.90);
java.text.NumberFormat nf = java.text.NumberFormat.getCurrencyInstance();
System.out.println(nf.format(amount));
This code will format the currency value based on the user's default locale. In the case of a user in the United States, for instance, the amount will be formatted with the U.S. dollar symbol ($) preceding the amount, the comma (,) character separating everything three digits to the left of the decimal point, and two digits to the right of the decimal.

Alternatively, you can explicitly specify a locale when obtaining the NumberFormat instance, such as:

 
Double amount = new Double(12345678.90);
java.text.NumberFormat nf =
java.text.NumberFormat.getCurrencyInstance(java.util.Locale.UK);
System.out.println(nf.format(amount));
This code will always format the amount using the conventions appropriate to the United Kingdom, regardless of the user's default locale.
Brett Spell
 
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