NumberFormat setMaximumFractionDigits method

Question

I am trying out the methods and the functionality of the class NumberFormat and I have reached to a strange result. I compile and run the following program:

public static void main(String[] args) {



Locale loc = Locale.US;

    NumberFormat nf = NumberFormat.getInstance(loc);

    System.out.println("Max: "+nf.getMaximumFractionDigits());

    System.out.println("Min: "+nf.getMinimumFractionDigits());

    try {

        Number d = nf.parse("4527.9997539");

        System.out.println(d);

        // nf.setMaximumFractionDigits(4);

        System.out.println(nf.format(4527.999753));

    } catch (ParseException e) {

        // TODO Auto-generated catch block

        e.printStackTrace();

    }



}

The outout is:

Max: 3

Min: 0

4527.9997539

4,528

That means that it does not take into account any fraction digit. If I uncomment the line:

nf.setMaximumFractionDigits(4);

The output is:

Max: 3

Min: 0

4527.9997539

4,527.9998

In other words it works OK. What is actually happening with method setMaximumFractionDigits and it does not bring the number containing 3 fraction digits in the first case?

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Answer 1

I found the answer finally. The method setMaximumFractionDigits() has an effect only on the method format(). It has nothing to do with parse(). In my code fragment I use the method format() after setting manually the numberof fraction digits to 4, consequently it affects the result.

NumberFormat setMaximumFractionDigits method

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