/* lab3-5a.java
           +-------------+
           | Ad          |
           +-------------+
                / \
                ---
                 |
         -------------------
         |                 |
+-------------+   +-------------+
| Commercial  |   | Service     |
+-------------+   +-------------+
| String name |   | String name |
| int minutes |   | int minutes |
| int profit  |   +-------------+
+-------------+

*/

// to represent an ad within a radio show
interface Ad{ }

// to represent a commercial ad within a radio show
class Commercial implements Ad {
  String name;
  int minutes;
  int profit;

  Commercial(String name, int minutes, int profit) {
    this.name = name;
    this.minutes = minutes;
    this.profit = profit;
  }
}

// to represent a service ad within a radio show
class Service implements Ad {
  String name;
  int minutes;

  Service(String name, int minutes) {
    this.name = name;
    this.minutes = minutes;
  }
}

// examples for the class hierarchy that represents radio ads
class Examples{
  Examples(){}
  
  // (define ipod-ad (make-ad "ipod" 2 100))
  Ad ipodAd = new Commercial("ipod", 2, 100);
  
  // (define ms-ad (make-ad "ms" 1 500))
  Ad msAd = new Commercial("ms", 1, 500);

  // (define xbox-ad (make-ad "xbox" 2 300))
  Ad xboxAd = new Commercial("xbox", 2, 300);

  // (define heart (make-service "heart-assoc" 1))
  Ad heart = new Service("heart-assoc", 1);
  
  // (define youth (make-service "youth-prog" 2))
  Ad youth = new Service("youth-prog", 2);
}