Java Currency Number format

Is there a way to format a decimal as following:

100   -> "100"  
100.1 -> "100.10"

If it is a round number, omit the decimal part. Otherwise format with two decimal places.

Solution 1:

I'd recommend using the java.text package:

double money = 100.1;
NumberFormat formatter = NumberFormat.getCurrencyInstance();
String moneyString = formatter.format(money);
System.out.println(moneyString);

This has the added benefit of being locale specific.

But, if you must, truncate the String you get back if it's a whole dollar:

if (moneyString.endsWith(".00")) {
    int centsIndex = moneyString.lastIndexOf(".00");
    if (centsIndex != -1) {
        moneyString = moneyString.substring(1, centsIndex);
    }
}

Solution 2:

double amount =200.0;
Locale locale = new Locale("en", "US");      
NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance(locale);
System.out.println(currencyFormatter.format(amount));

double amount =200.0;
System.out.println(NumberFormat.getCurrencyInstance(new Locale("en", "US"))
        .format(amount));

The best way to display currency

Output

$200.00

If you don't want to use sign use this method

double amount = 200;
DecimalFormat twoPlaces = new DecimalFormat("0.00");
System.out.println(twoPlaces.format(amount));

200.00

This also can be use (With the thousand separator )

double amount = 2000000;    
System.out.println(String.format("%,.2f", amount));

2,000,000.00

Solution 3:

I doubt it. The problem is that 100 is never 100 if it's a float, it's normally 99.9999999999 or 100.0000001 or something like that.

If you do want to format it that way, you have to define an epsilon, that is, a maximum distance from an integer number, and use integer formatting if the difference is smaller, and a float otherwise.

Something like this would do the trick:

public String formatDecimal(float number) {
  float epsilon = 0.004f; // 4 tenths of a cent
  if (Math.abs(Math.round(number) - number) < epsilon) {
     return String.format("%10.0f", number); // sdb
  } else {
     return String.format("%10.2f", number); // dj_segfault
  }
}

Solution 4:

I did not find any good solution after google search, just post my solution for other to reference. use priceToString to format money.

public static String priceWithDecimal (Double price) {
    DecimalFormat formatter = new DecimalFormat("###,###,###.00");
    return formatter.format(price);
}

public static String priceWithoutDecimal (Double price) {
    DecimalFormat formatter = new DecimalFormat("###,###,###.##");
    return formatter.format(price);
}

public static String priceToString(Double price) {
    String toShow = priceWithoutDecimal(price);
    if (toShow.indexOf(".") > 0) {
        return priceWithDecimal(price);
    } else {
        return priceWithoutDecimal(price);
    }
}

Solution 5:

NumberFormat currency = NumberFormat.getCurrencyInstance();
String myCurrency = currency.format(123.5);
System.out.println(myCurrency);

output:

$123.50

If you want to change the currency,

NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.CHINA);
String myCurrency = currency.format(123.5);
System.out.println(myCurrency);