Flash / Flex / ActionScript/Class/static

Reference static variable

   <source lang="java">

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.
           }
       }
   }
       </source>
   
  

Static Constants

   <source lang="java">

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;
           }
       }
   }
       </source>
   
  

Static Methods

   <source lang="java">

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;
 }

}

       </source>
   
  

Static Variables

   <source lang="java">

/* 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;
 }
       </source>
   
  

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

   <source lang="java">

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;
       }
   }
       </source>
   
  

Using Static Methods and Properties

   <source lang="java">

 

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;
       }
   }
       </source>