Classes - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  5.5K views 11 likes 1 dislikes   23 Feb 2015
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the next concept that you need to understand is the concept of classes
次に理解してもらいたい概念はクラスです
look at these dates here we have a date the date of the Mariner 4 spacecraft
このデータを見てください 宇宙船マリナー4号を打ち上げた日です
launch another date that happens to be the inauguration of FD Roosevelt and a
これはルーズベルト大統領が就任した日
third date the date of the first lunar landing now
3つ目は月面着陸に初めて成功した日です
all of these objects have something in common they're all day objects in Java
この3つには共通することがあります すべて日付に関するという点です
objects that have common behavior are collected into classes so the day class
Javaでは同じ性質を持つものは クラスに集約されます
is the class that contains all of the
DayクラスはDayオブジェクトが集まったものです
day objects and the reason you want to know about this is when you want to find out something about how days work you
理解すべき概念はこのDayオブジェクトが どう作用するかということです
will want to look at the documentation of the day class it tells you how every day object behaves let me give you
ではDayクラスの記述を見てみます everydayオブジェクトが何かが分かります
another example of a class here is a
クラスの例題をお見せします
string object and another and another all these string objects have something
HelloとGoodbyeとSo longという文字列があって この3つには共通項があります
in common they all have the same behavior and in Java the string class
すべて同じ性質を持っている点です JavaではStringクラスは共通する性質を表します
defines what that common behavior is you will learn a lot more about the string class in this lesson let's go back to
このレッスンでStringクラスについて もう少し学ぶことにします
our day class for a minute and think a bit more what it means for objects to
ではDayクラスに戻ってこれらのデータが持つ 共通の性質についてもう少し考えてみましょう
have common behavior it means that they can all do the same kinds of things like
この3つはすべて同じ働きをします
what can they do as you've seen when you played with days in bluej any day object
どんな働きでしょう？ 日付とBlueJで試したように
lets you get the month get to here or add days to itself these actions are
Dayオブジェクトを使って その年月日の情報を得ることができます
called the methods of the day class they are
これらはDayクラスメソッドと呼ばれます
the kinds of things that you can apply to day objects to achieve some kind of
種類は様々ですがそのDayオブジェクトを 応用すると何らかの機能を遂行できます
functionality the word method sounds a bit strange at first and you should just think of it as terminology it's just
メソッドという言葉に少し違和感が あるかもしれませんが専門用語と思ってください
what one calls the actions that you can apply to any of the day objects
メソッドとはDayオブジェクトを適用して 何らかのアクションを呼び出すためのものです
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