How to use the NumberFormat class

November 21, 2009
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import java.text.NumberFormat;

There are three static methods in the NumberFormat class:

  • getCurrencyInstance() to format as $99,999.99
  • getPercentInstance() to format as 99%
  • getNumberInstance() to format as 99,999,999

There are three methods in NumberFormat object

  • format(anyNumberType)
  • setMinimumFactionDigits(int)
  • setMaximumFractionDigits(int)

Example 1: The currency format

double price = 11.575;

NumberFormat currency = NumberFormat.getCurrencyIstance();

String priceString = currency.format(price); // returns $11.58

Example 2: The percent format

double majority = .505;

NumberFormat percent = NumberFormat.getPercentInstance();

String majoriySring = percent.getformat(majority); // return 50%

Example 3: The number format with one decimal place

doulbe miles = 15342.351;

NumberFormat number = NumberFormat.getNumberInstance();

number.setMaimumFractionDigits(1);

String milesString = number.format(miles); // returns 15,354.3