Get ActionScript 3.0 design patterns PDF

By William B Sanders; Chandima Cumaranatunge

ISBN-10: 0596528469

ISBN-13: 9780596528461

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It does have a name, parameter, and return type, but note that the function is only a single line. Example 1-17. as package { //Interface public interface BandFace { function playInstrument(strum:String):void; } } Each implementation of the interface must have exactly the same structure in all of the methods in the interface, and if anything is not the same, you’ll get an error message. As long as the signature for the methods is the same, everything should work fine. Example 1-18 is the first implementation of the of the BandFace interface.

The algorithm and everything else in the function that makes up the method is invisible to the implementation, and if the wrong parameter or wrong datatype is entered, either an error message appears or the value will not be passed. The following shows the general structure of a setter: function setterMethod(parameter) { if(parameter=="OK") { private variable = parameter; } } So the trick is to have the implementation pass any data to the object as a parameter, and if the parameter is acceptable, the private variable is assigned the parameter’s value.

When you test the file, you’ll see “Meow” appear on the screen. Such a response from your dog object is all wrong. Dogs don’t meow and cats don’t bark. However, that’s what can happen when you don’t encapsulate your class. When you multiply that by every un-encapsulated class you use, you can imagine the mess you might have. So let’s find a fix for this. Private variables The easiest way to insure encapsulation is to use private variables. 0, whether it’s used with variables, constants or methods (functions) makes sure that only the class that defines or declares it can use it.

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ActionScript 3.0 design patterns by William B Sanders; Chandima Cumaranatunge

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