java printf format double with a string parameter

Question

In Java, I want to scan user for formatString and inputDouble as follows:

Scanner scan = new Scanner(System.in);
System.out.println("Enter formating string and double to format:");
String formatString = scan.next();
Double inputDouble = scan.nextDouble();

But for now, let's say I only have

String formatString = "%.2f";
Double inputDouble = 42.424242;

I would to use the System.out.printf(); to format the inputDouble based on the formatString. Something like:

System.out.printf("Formated double: '%s'", formatString, inputDouble);

so something in form:

System.out.printf("Formated double: 'magicGoesHere'", formatString, inputDouble);

So in this particular case, I would like to see output:

Formated double: 42.42

Is it possible somehow? thanks

String.format(formatString, inputDouble), then use the resulting String in your System.out — MadProgrammer
– MadProgrammer, Commented Nov 4, 2015 at 23:49

razz · Accepted Answer · 2015-11-04 23:53:12Z

1

System.out.printf("Formated double: '%s'", String.format (formatString, inputDouble));

answered Nov 4, 2015 at 23:53

razz

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Andy Turner Over a year ago

Alternatively: System.out.printf(String.format("Formated double: '%s'", formatString), inputDouble).

Andy Turner · Accepted Answer · 2015-11-04 23:51:01Z

1

Split the call up into parts:

System.out.print("Formated double: '");
System.out.printf(formatString, inputDouble);
System.out.print("'");

answered Nov 4, 2015 at 23:51

Andy Turner

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Tomáš Vavro Over a year ago

nice trick, didn't think of it, but I really like it, Thanks :)

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