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To format a currency value by using NumberFormat involves these steps: 1 Obtain a NumberFormat instance by calling getCurrencyInstance( ) 2 Produce a string containing the formatted value by calling the format( ) method
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To format a value as currency, use getCurrencyInstance( ) to obtain a NumberFormat object It has two forms The one used here is static nal NumberFormat getCurrencyInstance( ) It returns an object that represents the currency of the current locale When formatting currencies, the fractional digits, grouping, and currency symbol are automatically supplied (It really is that easy!) Once you have configured the NumberFormat instance, you can format a value by calling format( ), which is described by the preceding recipe
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The following example shows how to format values as currency by using the NumberFormat class
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// Use javatextNumberFormat to format a currency value import javatextNumberFormat; import javautil*; class CurrencyFormatDemo { public static void main(String args[]) { NumberFormat nf = NumberFormatgetCurrencyInstance(); Systemoutprintln("198999 and -2105 in currency format: " + nfformat(198999) + " " + nfformat(-2105)); } }
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198999 and -2105 in currency format: $1,98999 ($21050)
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Options and Alternatives
You can format relative to a specific locale by using this version of getCurrencyInstance( ): static NumberFormat getCurrencyInstance(Locale loc) The locale is passed via loc (Locale is described in Specify a Locale When Formatting)
He rb Sc h i ldt s Java P rog ra m m i n g Cookbook
Format Numeric Values with Patterns Using DecimalFormat
Key Ingredients
Classes javatextDecimalFormat Methods final String format(double val)
javatextDecimalFormat is a concrete subclass of NumberFormat It allows you to define your own formatting patterns that are used to display numeric information, including integer and floating-point values As such, it offers an interesting alternative to both NumberFormat and Formatter
Step-by-Step
To format a numeric value using DecimalFormat involves the following steps: 1 Create a pattern that describes the desired numeric format 2 Create a DecimalFormat instance, specifying the pattern 3 Produce a string containing a formatted value by calling the format( ) method, specifying the value to be formatted
Discussion
DecimalFormat defines three constructors The one we will use is shown here: DecimalFormat(String fmtStr) The argument fmtStr describes a pattern that depicts how a numeric value is displayed A pattern consists of symbols that determine how the value is displayed Table 4-5 shows the symbols and gives a description of each
Symbol , # 0 % E \u00a4 /u2030 Description Decimal point Group separator Digit, trailing zeros are not shown Digit, trailing zeros are shown Minus Show the value as a percentage (In other words, multiply the value by 100) The E in scientific notation Quote a symbol so as to use it as a normal character Currency symbol appropriate for locale Show the value in terms of milles (In other words, multiply the value by 1000)
TABLE 4-5 A Sampling of Formatting Symbols for DecimalFormat
4:
Formatting Data
All DecimalFormat patterns consist of two subpatterns: one for positive values and one for negative values However, the negative subpattern need not be explicitly specified If it is not present, then the negative pattern consists of the positive pattern prefixed with a minus sign The two subpatterns are separated by a semicolon (;) Once a pattern has been specified, all numeric output will be formatted to match the pattern Here is an example:
"#,###00;(#,###00)"
This creates a pattern that uses group separators every three digits and shows trailing zeros It also shows negative values inside parentheses Once you have constructed a DecimalFormat with the desired pattern, use format( ) (inherited from NumberFormat) to create the formatted output (See Format Numeric Values with NumberFormat for details)
Example
The following example demonstrates DecimalFormat
// Demonstrate DecimalFormat import javatext*; public class DFDemo { public static void main(String args[]) { DecimalFormat df; // Use group separators and show trailing zeros // Negative values are shown inside parentheses df = new DecimalFormat("#,###00;(#,###00)"); Systemoutprintln(dfformat(712300)); Systemoutprintln(dfformat(-712300)); // Don't show trailing zeros df = new DecimalFormat("#,#####;(#,#####)"); Systemoutprintln(dfformat(712300)); Systemoutprintln(dfformat(-712300)); // Display a percentage df = new DecimalFormat("#%"); Systemoutprintln(dfformat(019)); Systemoutprintln(dfformat(-019)); // Display a currency value df = new DecimalFormat("\u00a4#,##000"); Systemoutprintln(dfformat(423219)); Systemoutprintln(dfformat(-423219)); } }
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