Use INFINITY and NaN value in Java

/*w w w  .ja va2  s  . c o  m*/
public class Main {
  public static void main(String[] argv) {
    double d = 123;
    double e = 0;
    if (d/e == Double.POSITIVE_INFINITY)
      System.out.println("Check for POSITIVE_INFINITY works");
    double s = Math.sqrt(-1);
    if (s == Double.NaN)
      System.out.println("Comparison with NaN incorrectly returns true");
    if (Double.isNaN(s))
      System.out.println("Double.isNaN() correctly returns true");
  }
}