OUTPUTTING CURRENCIES

How to print out a Currency in Java is an often-missed topic. The issue
is how should a Currency be printed out in an international, 
standardized
way?

The java.text.NumberFormat class is used for outputting numbers. It
handles decimal points and inserting commas. For example: 10000.1273333 
-->
10,000.13

It also handles internationalization. Many locales use a space or a dot
to separate the thousands and a comma to separate the decimals. For
example in Hungary, the above would be: 10000.1273333 --> 10 000,13.

However, the NumberFormat class can do more. It has a Currency instance
that knows what symbols to use when outputting a currency and how to
format the number. For example, 50000.25 in the United States would be,
$50,000.25.
Whereas in Hungary, it would be Ft50 000,250.

The easiest way to print a value is to use the default Locale:


Locale loc = Locale.getDefault();
NumberFormat nf = NumberFormat.
getCurrencyInstance(loc);
System.out.println(nf.format(50444.423));

Also, you can easily print out all the Currency formats in the 
available
Locales:

import java.text.NumberFormat;
import java.util.Locale;

public class Currency {

static public void main(String[] strs) {
Locale[] locs = NumberFormat.
getAvailableLocales();
for(int i=0; i<locs.length; i++) {
NumberFormat nf = NumberFormat.
getCurrencyInstance(locs[i]);
System.err.print(locs[i].
getLanguage());
System.err.print("_");
System.err.print(locs[i].
getCountry());
System.err.print("_");
System.err.print(locs[i].
getVariant());
System.err.print(" ");
System.err.println(nf.
format(50444.423));
}
}

}

Using the NumberFormat class makes it easier to standardize an
international solution to outputting Currencies.

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