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nunia
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加入时间: 2005/11/04
文章: 2184
经验值: 5079
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作者：nunia 在 寒山小径 发贴, 来自 http://www.hjclub.org
this cracks me up. had to re-post it here:
OOP Concept explained: Polymorphism (Technology)
The problem with most computer science texts is the examples aren't interesting. Polymorphism isn't really hard to understand, but the examples are usually boring or difficult to understand. This is an alternative text which attempts to use a problem space that's already familiar to the college student to make the concepts of programming simple.
Pre-requisite skills You must be comfortable with classes and objects and read basic java/c# to follow this lesson.
Polymorphism shouldn't be a new concept to anybody. You deal with it every day in the real world. There's more than one class of cat to skin, but you skin 'em the same way, even if the specific instance is completely new to you. Let's say for example you want to fuck a hole. You fuck all holes the same. You don't care if that hole happens to be a mouth, an ass, or a pussy, you're gonna fuck it the same way regardless. However, the mouth, pussy, or ass may respond differently to the fucking.
So you have a common abstract class named 'Hole' and 3 concrete classes Pussy, Ass, and Mouth which all extend from Hole:
class Pussy extends Hole {}
class Mouth extends Hole {}
class Ass extends Hole {}
So, now let's say you have a Penis.Fuck(Hole h) method. The Penis class is unconcerned about what the specific Hole instance is, it's gonna fuck it the same regardless. Specificly we thrust the Hole with a Penis until the Penis is spent. Finally, we give the hole the Penis' load.
class Penis {
public Fuck(Hole h) {
while(!this.isSpent) {
h.TakeAThrust(this);
this.arousal++;
}
h.TakeALoad(this.load);
}
}
Now here's where polymorphism gets fun. The Hole will respond different to the thrusting and load depending on what specific type of Hole we're implementing.
First we must implement an abstract class which defines an abstract interface.
abstract class Hole {
public abstract void TakeAThrust(Penis p);
public abstract void TakeALoad(Load l);
}
Now all that's left is the varying implementations of these methods in the seperate concrete classes. For example, an Ass' implementation of TakeAThrust could look something like:
public void TakeAThrust(Penis p) {
if(!enoughLube && p.Circumference > 6) {
analFissureCount++;
}
}
See, the beauty of it is... the Penis doesn't even need to know it's fucking an Ass for the Ass to behave like a proper Ass.
Now, let's see how we might implement TakeALoad differently for Mouth and Pussy:
//in Pussy
public void TakeALoad(Load l) {
//randomly determine whether to cause a pregnancy with a 10% chance...
if(Math.RandomNumber() % 10 == 0) {
this.Woman.EggFactory.GetEgg().Inseminate(l);
}
}
//in Mouth
public void TakeALoad(Load l) {
//50-50 chance of spitting or swallowing
if(Math.RandomNumber() % 1 == 0) {
this.Spit(l);
} else {
this.Swallow(l);
}
}
Putting it all together with client code
Now that we have our classes well planned out with polymorphism in mind, we can see the kind of luxury it is for the client programmer to work with.
//create an array of 4 women
Woman[] women = new Woman[]{new Woman(), new Woman(), new Woman(), new Woman()};
//create a hole array to reference the holes of all 4 women, plus two additional holes.
Hole[] holes = new Hole[4*3 + 2];
for(int i = 0; i < women.Length; i++) {
holes[3 * i + 0] = women[i].Mouth;
holes[3 * i + 1] = women[i].Pussy;
holes[3 * i + 2] = women[i].Ass;
}
//additional holes (so the faggy programmers don't feel left out)
Man m = new Man();
holes[12] = m.Mouth;
holes[13] = m.Ass;
//now we loop through the holes and fuck them all with the same Penis
Penis p = new Man().Penis;
foreach(Hole h in holes) {
p.Fuck(h);
}
See how easy it makes it for the client programmer?
Thank you class, any questions?
http://www.kuro5hin.org/story/2006/7/29/191347/498
作者：nunia 在 寒山小径 发贴, 来自 http://www.hjclub.org |
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