Coupling Between Classes - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  4.1K views 10 likes 3 dislikes   23 Feb 2015
Udacity 651K subscribers United States YouTube↗


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Let me tell you about a useful concept that you can use to organize your
効率のよいクラス編成に役立つ概念について お話しします
classes effectively. It's called the concept of coupling. And we'll say that a
それは“連結”と呼ばれるものです
class is coupled with another if it uses the other class. In fact,
クラスが他のクラスを使う場合 クラスが“連結している”と言います
[INAUDIBLE] shows us this relationship, with these arrows that you may have noticed before.
BlueJではこの矢印が クラスのつながりを示しています
In this example, the Car class. Is coupled with a Person class, because the
この例ではCarクラスは Personクラスと連結しています
code of the Car class uses personal objects. But the Person class is not
CarクラスはPersonオブジェクトを使うからです 一方でPersonクラスは
coupled with the Car class because the personal object actually knows nothing about cars. Let me show you. When you look at the code of the Person class
Carクラスのことを知らないので連結していません 見てみましょう
you'll see there are no cars inside, but when you look at the code for the Car
PersonクラスにはCarはどこにもありませんね しかしCarクラスでは
class, there's a person here, and a Person class is used up here. Like I said,
ここにPersonがいて Personクラスがここで使われています
the Car class knows about the Person class, but the Person class doesn't know
CarクラスはPersonクラスを知っていますが Personクラスは
about the Car class. It's a good idea if not every class knows about every
Carクラスを知りません しかし知らないのはよいことです
other, it makes it easier to make changes. For example, if we make a change in
変更が簡単です　例えばCarクラスを変更しても
the Car class, the Person class doesn't care. It never knew the class in the
Carクラスを知らないPersonクラスには 影響しません
first place. One wants to keep the coupling between classes as low as possible.
クラス間の連結はできるだけ少なくしましょう
Let's see what other classes the Car class might be coupled with. Go ahead, go
ではCarクラスが他のどのクラスと連結しているか 見てみましょう
through the code of the Car class, and give me a list of all of the classes
Carクラスが使っているすべてのクラスを 書き出してください
that the Car class uses. Just put the names of the classes into this box.
この枠にクラスの名前を入れてください
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