// Example 52 from page 39 of Java Precisely second edition (The MIT Press 2005)
// Author: Peter Sestoft (sestoft@itu.dk)


class Example52 {
  public static void main(String[] args) {
    // Instance test
    Number n1 = new Integer(17);
    Number n2 = new Double(3.14);
    // The following statements print: false, true, false, true
    System.out.println("n1   is a Double: " + (n1 instanceof Double));
    System.out.println("n2   is a Double: " + (n2 instanceof Double));
    System.out.println("null is a Double: " + (null instanceof Double));
    System.out.println("n2   is a Number: " + (n2 instanceof Number));
  }
}