Question

Is there a way to use DecimalFormat (or some other standard formatter) to format numbers like this:

1,000,000 => 1.00M

1,234,567 => 1.23M

1,234,567,890 => 1234.57M

Basically dividing some number by 1 million, keeping 2 decimal places, and slapping an ‘M’ on the end. I’ve thought about creating a new subclass of NumberFormat but it looks trickier than I imagined.

I’m writing an API that has a format method that looks like this:

public String format(double value, Unit unit); // Unit is an enum 

Internally, I’m mapping Unit objects to NumberFormatters. The implementation is something like this:

public String format(double value, Unit unit) {     NumberFormatter formatter = formatters.get(unit);     return formatter.format(value); } 

Note that because of this, I can’t expect the client to divide by 1 million, and I can’t just use String.format() without wrapping it in a NumberFormatter.

Answer 1

String.format('%.2fM', theNumber/ 1000000.0); 

For more information see the String.format javadocs.