Statements
195
The following example instantiates a Car object, calls a method defined in the Vehicle class
(
start()
), then calls the method overridden by the Car class (
stop()
), and finally calls a
method from the Car class (
activateCarAlarm()
):
var myNewCar:Car = new Car(2, "Red", true);
myNewCar.start(); // output: [Vehicle] start
myNewCar.stop(); // output: [Car] stop with anti-lock brakes
myNewCar.activateCarAlarm(); // output: [Car] activateCarAlarm
A subclass of the Vehicle class can also be written using the keyword
super
, which the subclass
can use to access properties and methods of the superclass. The following example shows a
third AS file, called Truck.as, again in the same directory. The Truck class uses the
super
keyword in the constructor and again in the overridden
reverse()
function.
class Truck extends Vehicle {
var numWheels:Number;
function Truck(param_numDoors:Number, param_color:String,
param_numWheels:Number) {
super(param_numDoors, param_color);
this.numWheels = param_numWheels;
}
function reverse():Void {
beep();
super.reverse();
}
function beep():Void {
trace("[Truck] make beeping sound");
}
}
The following example instantiates a Truck object, calls a method overridden by the Truck
class (
reverse()
), then calls a method defined in the Vehicle class (
stop()
):
var myTruck:Truck = new Truck(2, "White", 18);
myTruck.reverse(); // output: [Truck] make beeping sound [Vehicle] reverse
myTruck.stop(); // output: [Vehicle] stop
See also
class statement
Summary of Contents for Flash Lite 2
Page 1: ...Flash Lite 2 x ActionScript Language Reference...
Page 22: ...22 Contents...
Page 244: ...244 ActionScript language elements...
Page 760: ...760 ActionScript classes...