How do you test to see if a double is equal to NaN?

How do you test to see if a double is equal to NaN?

java double equality nan

java

Why does Double.NaN==Double.NaN return false?

java floating-point nan scjp ocpjp

java

In Java, what does NaN mean?

java nan

java

Are the bit patterns of NaNs really hardware-dependent?

java floating-point nan ieee-754

java

Why are floating point infinities, unlike NaNs, equal?

java floating-point comparison nan infinity

java

How are NaN and Infinity of a float or double stored in memory?

java nan infinity

java