Is double positive infinity

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 (Double.isNaN(s)){
      System.out.println("Double.isNaN() correctly returns true");
    }    
  }
}