Java：以百万为单位的格式数字

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问题描述

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.

解决方案

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

For more information see the String.format javadocs.

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