Formatting currency in Java with String.format


Posted by Steven

There are common tasks in programming I never performed in a production project. Formatting currency is one of them. I only noticed that when I searched a library that would offer formatting methods. After searching for a while and wondering why so many libraries exist, a colleague found a surprisingly easy solution: String.format(). Here is some code to show how to format currency with plain Java.

  1. void formatCurrency(BigDecimal value) {
  2.  
  3. 	// %,  => local-specific thousands separator
  4. 	// .2f => positions after decimal point
  5.  
  6. 	return String.format("%,.2f", price);
  7. }
  8.  
  9. @Test
  10. void formattingOfBigDecimalToString() {
  11.  
  12. 	BigDecimal priceToFormat = BigDecimal.valueOf(23356);
  13. 	String formattedPrice = formatCurrency(priceToFormat);
  14. 	assertEquals("23.356,00", formattedPrice);
  15.  
  16. 	priceToFormat = BigDecimal.valueOf(3245.9);
  17. 	formattedPrice = formatCurrency(priceToFormat);
  18. 	assertEquals("3.245,90", formattedPrice);
  19.  
  20. 	priceToFormat = BigDecimal.valueOf(89645.99);
  21. 	formattedPrice = formatCurrency(priceToFormat);
  22. 	assertEquals("89.645,99", formattedPrice);
  23.  
  24. 	priceToFormat = BigDecimal.valueOf(989645.99);
  25. 	formattedPrice = formatCurrency(priceToFormat);
  26. 	assertEquals("989.645,99", formattedPrice);
  27.  
  28. 	priceToFormat = BigDecimal.valueOf(1230490);
  29. 	formattedPrice = formatCurrency(priceToFormat);
  30. 	assertEquals("1.230.490,00", formattedPrice);
  31.  
  32. 	priceToFormat = BigDecimal.valueOf(1230490.01);
  33. 	formattedPrice = formatCurrency(priceToFormat);
  34. 	assertEquals("1.230.490,01", formattedPrice);
  35. }

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