Java Double isNaN method example

CODING:
public class JavaDoubleIsNaNExample
{
  public static void main(String[] args)
{
    double d = Math.sqrt(-10);
    boolean b1 = Double.isNaN(d);
    System.out.println(b1);
    Double dObj = new Double(d);
    boolean b2 = dObj.isNaN();
    System.out.println(b2);
  }
}

OUTPUT:

true

true