// ----------------------------------------------------------------------
// CLASS DEFINITIONS
// ----------------------------------------------------------------------
class Parent {
  // constructor
  Parent() {
    println("Building a Parent.");
  }

  void speak() {
    println("I am a Parent.");
  }
}

// use the keyword "extends" to create a child/subclass
class Child extends Parent {
  void speak() {
    println("I am a Child.");
  }
}

// ----------------------------------------------------------------------
// GLOBAL VARIABLES
// ----------------------------------------------------------------------
// declare a Parent object
Parent p;
// declare a Child object
Child c;

// ----------------------------------------------------------------------
// MAIN
// ----------------------------------------------------------------------
void setup() {
  // instantiate the Parent object
  p = new Parent();
  // instantiate the Child object
  c = new Child();
  
  p.speak();
  c.speak();
}