How to check whether a number is a "NaN" in Java / Android?

Question

Please have a look at the following code

private List createTheDynamicWordList(String algorithm, double averageStat)
    {

        Toast.makeText(context, ""+averageStat, Toast.LENGTH_LONG).show();
}

in some cases, I get the averageStat as a 'NaN' value. I need to check whether the number if 'NaN' or not. How can I do this? Using NumberFormatException here didn't work.

How can you possibly get `averageStat` as `NaN`? Are you sure you're working in Java and not JavaScript? — Aleks G, Aug 20 '13 at 09:02
@AleksG: Yes. This is a kind of statistic generation from a database. When "Divide By 0" I have to get this. I couldn't track it with exception handling, maybe because it is inside a loop — PeakGen, Aug 20 '13 at 09:08

Blackbelt · Accepted Answer · 2014-05-01T20:13:37.910

25

in your case should be enough:

   if (Double.isNaN(averageState))

take a look here

edited May 01 '14 at 20:13

answered Aug 20 '13 at 09:01

Blackbelt

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score 5 · Answer 2 · answered Aug 20 '13 at 09:01

5

Use static method Double.isNaN()

answered Aug 20 '13 at 09:01

Leszek

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How to check whether a number is a "NaN" in Java / Android?

2 Answers2