CODEWITHSUNDEEP
javastringnan
matcauthon
matcauthon

Reputation: 2261

Parse String to Double.NaN

i want to let users edit a field with double data. I want to allow Double.NaN (to void values). Is there a generic way (a predefined string) that is parsed to Double.NaN from the method Double.valueOf(String) without checking it in the background?

There is a special char looking like a diamond with a question mark in it (in HTML) that acts like NaN, but - well - the users wont find that on their keys.

Upvotes: 10

Views: 11653

Answers (2)

Joachim Sauer
Joachim Sauer

Reputation: 308041

parseDouble("NaN") will return a NaN value:

System.out.println(Double.isNaN(Double.parseDouble("NaN"));

Upvotes: 3

David Heffernan
David Heffernan

Reputation: 612993

You can pass +NaN or -NaN or NaN to valueOf() and have it return a NaN. The documentation gives the full details.

Upvotes: 13

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