See if a floating-point result is NaN, use the Float.isNaN or Double.isNaN static method. : double « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » double 
1.14.5.See if a floating-point result is NaN, use the Float.isNaN or Double.isNaN static method.
public class MainClass {
  public static void main(String[] argv) {
    float i = 1;
    float j = 1;

    System.out.println(i / (j - 1));
    System.out.println(Float.isNaN(i / (j - 1)));

  }
}
1.14.double
1.14.1.Attach a D or d to double literals, but it is not necessary.
1.14.2.NaN values indicates that a calculation has no result in ordinary arithmetic
1.14.3.A value containing a decimal point is assumed to be the 64-bit double,
1.14.4.Division by zero in floating-point-arithmetic: No exception occurs;
1.14.5.See if a floating-point result is NaN, use the Float.isNaN or Double.isNaN static method.
1.14.6.Float and Double classes define MAX_VALUE, MIN_VALUE, POSITIVE_INFINITY, and NEGATIVE_INFINITY.
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