ActionScript 3.0 Design Patterns.pdf - VideoTutorials-bg.com

Example 3-5. BadImplementation.as (continued)
}
{
}
public function BadImplementation( )
{
var mySingleton=new Singleton( );
}
Save the file as BadImplementation.as in the same folder as the Singleton.as. Ina
Flash document, type in BadImplementation in the Document class window, and test
the application. As predicted, you get a compiler error as shown in Figure 3-2.
Figure 3-2. Compiler error expecting argument
Immediately you see that the Singleton constructor contains an argument, a
PrivateClass, and so the natural response is to change the code to include a
PrivateClass argument as shown in Example 3-6.
Example 3-6. Attempt to add private class parameter
package
{
import flash.display.Sprite
public class BadImplementation extends Sprite
{
public function BadImplementation( )
{
var mySingleton=new Singleton(new PrivateClass( ));
}
}
}
Re-save the BadImplementation.as file and test it again. This time, you get a different
error as shown in Figure 3-3:
Minimalist Abstract Singleton | 107