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Use java text NumberFormat to format a currency value

import java.text.NumberFormat; public class Main {   public static void main(String[] argv) throws Exception {     NumberFormat nf = NumberFormat.getCurrencyInstance();     System.out.println("currency format: " + nf.format(1234.56) + " "         + nf.format(-1234.56));   } } //currency format: $1,234.56 -$1,234.56