4: Object Oriented Programming in Java

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4: Object Oriented Programming
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A drawback of private items is that they are not inherited by subclasses. So if the Toaster class had a private property finish that described its paint job, the HeatedResistorToaster would not be able to share it. You would have to add it again to the HeatedResistorToaster de nition and to any other class that derives from Toaster. In the le com/actionscriptbible/ch4/Toaster.as:
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package com.actionscriptbible.ch4 { public class Toaster { private var finish:String = "Reflective Silver"; } }
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In the le com/actionscriptbible/ch4/HeatedResistorToaster.as:
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package com.actionscriptbible.ch4 { public class HeatedResistorToaster extends Toaster { public function HeatedResistorToaster() { trace(finish); //Compiler error! We don t have a finish. } } }
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When you use inheritance to extend classes and you want items in the superclass to be available to the subclass but not to the outside world, use the protected attribute. A property or method declared as protected in a class will be available to any class that inherits from it. To get the finish property to be available to Toaster s subclasses, you change its de nition to protected. In the le com/actionscriptbible/ch4/Toaster.as:
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package com.actionscriptbible.ch4 { public class Toaster { protected var finish:String = "Reflective Silver"; } }
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In the le com/actionscriptbible/ch4/HeatedResistorToaster.as:
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package com.actionscriptbible.ch4 { public class HeatedResistorToaster extends Toaster { public function HeatedResistorToaster() { trace(finish); //Reflective Silver } } }
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It s almost always a good idea to keep your classes open for extension. If, after you wrap up and deliver your toasting program, you nd that you need more toasting power, you might decide to create a toaster class with multiple resistors. A quick way to do this is to extend the HeatedResistorToaster class and add a second resistor, modifying the startCurrent() and stopCurrent() methods to support two resistors. To do this, you need to go back and make those methods protected instead of private. Whether private or protected, those methods are not available to
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classes outside the Toaster class hierarchy, so you haven t lost anything, but you needed to modify a class that you should have just been able to extend. Unless you have a reason to hide a property or method from every class in the class hierarchy or you re sure the class will never be extended, you should use protected over private. Using protected variables makes code easy to extend, even if you don t foresee a reason to right now. Use protected to encourage extension and final to prohibit it.
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The idea that you should be able to add on to your program without changing anything that s already written is a principle of object oriented design called the Open-Closed Principle. According to the principle, code you write should be open for extension but closed for modi cation. This recognizes that code that s done means code that s been thought about, written, and tested. A lot of work has gone into it. It also recognizes that you should be able to add functionality to programs after you consider them done, because even if you hate doing it, you always need to. Composition and inheritance are ways to add more functionality without touching code that already exists; you should favor this to modifying completed, tested code.
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The internal attribute is tied to the concept of packages. Frequently you have classes that need to work closely together and sometimes have privileged access to each other: access that should not generally be open but is acceptable within a certain group of classes. For example, in the toaster example, you had to modify the toastiness of the bread directly. But why would you need a toaster at all if that attribute were publicly available If toastiness were public, a Bicycle or a Seagull could go about toasting bread as if it were its business. This is de nitely not desirable, but you have to have some way to change the properties of the bread. In this case, it might be a good idea to keep all the kitchenware classes in a kitchen package, including the Bread class, and to make toastiness an internal property. Now only kitchenware is allowed to modify the toastiness of bread. In the le com/actionscriptbible/ch4/kitchen/Bread.as:
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package com.actionscriptbible.ch4.kitchen { public class Bread { internal var toastiness:Number = 0; } }
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Now you attempt to toast the bed from a nonkitchenware object. In the le com/actionscriptbible/ch4/bedroom/Pillow.as:
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package com.actionscriptbible.ch4.bedroom { import com.actionscriptbible.ch4.kitchen.Bread; public class Pillow { public function Pillow() { var b:Bread = new Bread(); b.toastiness = 20; //Compiler error! You can t do this! } } }
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