FLASH® LITE™ 2.x - Adobe Help and Support

class Vehicle {
var numDoors:Number;
var color:String;
function Vehicle(param_numDoors:Number, param_color:String) {
this.numDoors = param_numDoors;
this.color = param_color;
}
function start():Void {
trace("[Vehicle] start");
}
function stop():Void {
trace("[Vehicle] stop");
}
function reverse():Void {
trace("[Vehicle] reverse");
}
}
The following example shows a second AS file, called Car.as, in the same directory. This class
extends the Vehicle class, modifying it in three ways. First, the Car class adds a variable
fullSizeSpare to track whether the car object has a full-size spare tire. Second, it adds a new
method specific to cars, activateCarAlarm(), that activates the car's anti-theft alarm. Third,
it overrides the stop() function to add the fact that the Car class uses an anti-lock braking
system to stop.
class Car extends Vehicle {
var fullSizeSpare:Boolean;
function Car(param_numDoors:Number, param_color:String,
param_fullSizeSpare:Boolean) {
this.numDoors = param_numDoors;
this.color = param_color;
this.fullSizeSpare = param_fullSizeSpare;
}
function activateCarAlarm():Void {
trace("[Car] activateCarAlarm");
}
function stop():Void {
trace("[Car] stop with anti-lock brakes");
}
}
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
180 ActionScript language elements