Flash / Flex / ActionScript/Class/static

Reference static variable

 

class Bicycle
    {
        static public var wheels:Number = 2;
        private var _gears:Number;
        public function get gears():Number
        {
            return _gears;
        }
        public function Bicycle(numberOfGears:Number)
        {
            this._gears = numberOfGears;
            for (var i:int = 0; i < Bicycle.wheels; i++)
            {
                //Prepare a wheel.
            }
        }
    }

Static Constants

 
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var stuntBike:Bicycle = new Bicycle();
        stuntBike.performTrick("wheely"); //nothing happens

    }
  }
}
class Bicycle
    {
        static public const WHEELS:Number = 2;
        //the rest of the class...
        public function performTrick(trickName:String):void
        {
            switch (trickName)
            {
                case "wheelie":
                    //code goes here to wheelie
                    break;
                case "bunnyhop":
                    //code goes here to bunny hop
                    break;
                case "stoppie":
                    //code goes here to stoppie
                    break;
            }
        }
    }

Static Methods

 
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        StringUtils.contains("me@moock.org", "@");
    }
  }
}
internal class StringUtils {
  public static function contains (string, character) {
    for (var i:int = 0; i <= string.length; i++) {
      if (string.charAt(i) == character) {
        return true;
      }
    }
    return false;
  }
}

Static Variables

 
/*
class SomeClass {
  static var identifier = value;
}
class SomeClass {
  private static var identifier = value;
}
SomeClass.identifier = value;
*/
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
       trace(MyClass.maxNameLength);
    }
  }
}
  internal class MyClass {
    static var maxNameLength = 20;
    static var maxCalories = 2000;
  }

Static Variables: define methods and properties that belong to the class itself, rather than their instances.

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var fixedGear:Bicycle = new Bicycle(1);
       // trace(fixedGear.wheels); //Wrong! Compiler error.
        trace(Bicycle.wheels); //Right! 2

    }
  }
}
class Bicycle
    {
        public static var wheels:Number = 2;
        private var _gears:Number;
        public function get gears():Number
        {
            return _gears;
        }
        public function Bicycle(numberOfGears:Number)
        {
            this._gears = numberOfGears;
        }
    }

Using Static Methods and Properties

 
  
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var eighteenSpeed:Bicycle = new Bicycle(18);
        var fixedGear:Bicycle = new Bicycle(1);
        
        trace(eighteenSpeed.gears); //18
        trace(fixedGear.gears); //1

    }
  }
}
    class Bicycle
    {
        private var _gears:Number;
        public function get gears():Number
        {
            return _gears;
        }
    public function Bicycle(numberOfGears:Number)
    {
            this._gears = numberOfGears;
        }
    }