java.text.DecimalFormat用法详解

/**
 * Created by Shuai on 2016/7/11.
 */
public class Main {
  public static void main(String[] args) {

    // 正值
    BigDecimal bigDecimal = BigDecimal.valueOf(-12211151515151.541666);

    // 负值
    BigDecimal bigDecimal2 = BigDecimal.valueOf(12211151515151.541666);
    String pattern = "#,##0.00;(#,##0.00)";
    DecimalFormat decimalFormat = new DecimalFormat(pattern);
    decimalFormat.format(bigDecimal);
    System.out.println(decimalFormat.format(bigDecimal));
    System.out.print(decimalFormat.format(bigDecimal2));
  }
}

(12,211,151,515,151.54)
12,211,151,515,151.54

public class Main {
  public static void main(String[] args) {

    BigDecimal bigDecimal = BigDecimal.valueOf(-0.00);
    BigDecimal bigDecimal2 = BigDecimal.valueOf(0.00);
    String pattern = "0.00;(0.00)";
    DecimalFormat decimalFormat = new DecimalFormat(pattern);
    decimalFormat.format(bigDecimal);
    System.out.println(decimalFormat.format(bigDecimal));
    System.out.print(decimalFormat.format(bigDecimal2));
  }
}

0.00
0.00

System.out.print(decimalFormat.parse(",,,1,515,115.26262", new ParsePosition(0)));

1515115.26262

public class Main {
  public static void main(String[] args) {

    BigDecimal bigDecimal = BigDecimal.valueOf(65652323265.626262);
    String pattern = "#,##,###,###0.00";
    String pattern2 = "######,###0.00";
    String pattern3 = "##,####,###0.00";
    DecimalFormat decimalFormat = new DecimalFormat(pattern);
    System.out.println(decimalFormat.format(bigDecimal));
    decimalFormat.applyPattern(pattern2);
    System.out.println(decimalFormat.format(bigDecimal));
    decimalFormat.applyPattern(pattern3);
    System.out.println(decimalFormat.format(bigDecimal));
  }
}

656,5232,3265.63
656,5232,3265.63
656,5232,3265.63

// Print out a number using the localized number, integer, currency,
 // and percent format for each locale
 Locale[] locales = NumberFormat.getAvailableLocales();
 double myNumber = -1234.56;
 NumberFormat form;
 for (int j=0; j<4; ++j) {
   System.out.println("FORMAT");
   for (int i = 0; i < locales.length; ++i) {
     if (locales[i].getCountry().length() == 0) {
      continue; // Skip language-only locales
     }
     System.out.print(locales[i].getDisplayName());
     switch (j) {
     case 0:
       form = NumberFormat.getInstance(locales[i]); break;
     case 1:
       form = NumberFormat.getIntegerInstance(locales[i]); break;
     case 2:
       form = NumberFormat.getCurrencyInstance(locales[i]); break;
     default:
       form = NumberFormat.getPercentInstance(locales[i]); break;
     }
     if (form instanceof DecimalFormat) {
       System.out.print(": " + ((DecimalFormat) form).toPattern());
     }
     System.out.print(" -> " + form.format(myNumber));
     try {
       System.out.println(" -> " + form.parse(form.format(myNumber)));
     } catch (ParseException e) {}
   }
 }