The Display Method - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  6.8K views 8 likes 4 dislikes   23 Feb 2015
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Now, let's turn to the implementation of the display method. It's supposed to
ではdisplayメソッドの実装を始めましょう
display a choice question in this format. First, the text of the question. Then
このメソッドは選択問題をこの形式で表示します 最初は質問文で
all of the choices, and we put a 1, 2, 3, 4 in front of each of the choices in
次にすべての選択肢です　解答者が答える際に
case the poor test taker is too frazzled to figure out the numbers themselves.
迷わないように各選択肢の前に 1、2、3、4と振っておきます
It's easy enough to do this part. All we have to do is loop through the choices
この部分の処理はとても簡単です 選択肢をループで回して
and print them with a number in front of them. And since this has nothing to do
その前に番号を出力するだけです これは継承の学習とは
with learning about inheritance, I'm just going to give you this code. It's
無関係なのでこのコードをお見せします　これです
right here. So we print the number of the ith choice and the ith item. actually
i番目の選択肢の番号と中身を出力します 番号とiはまったく同じではありません
not quite because in Java the choices have indexes, zero, one, two, and three.
Javaでchoicesのインデックスは ゼロ、1、2、3だからです
And we chose the more traditional one, two, three, four, which accounts for the
より一般的な1、2、3、4としたいので
i plus 1 over here. The hard part is to display the text of the question. And
ここはi ＋ 1とします 難しいのは質問文を表示する部分です
again, the question text is in the Superclass object, and we can't get at it
質問文textは スーパークラスのオブジェクト内にあるので
directly. Let's have a look at the Super class. Here is the question text, do
直接得ることはできません スーパークラスを見てみましょう これが質問文textです
we have any method that let's us read it? there is, And we could call display,
これを表示させるメソッドを探します このdiplayメソッドを呼び出せば
and then it would print it. That's just what we need. let's do it. Here I call
質問文textを出力できます これが欲しかったものです　実行してみましょう
display that should display the text and then here I am displaying these
質問文textを表示するdisplayメソッドを呼び出し
choices around the demo. Oh! something very bad happened, I got a
choicesを表示させます　デモを実行すると 非常に悪いことが起こりました
StackOverflowError. Now, that's technical link of for having a method that
スタックオーバーフローエラーといって 再帰呼び出しを続けるメソッドの技術用語です
keeps calling itself. why itself? See the method is called display and here it
なぜ再帰になったのでしょう displayというメソッド内でdisplayメソッドを
calls itself. That's a problem, I didn't want to call my own method, I wanted
呼び出しています　これが問題です 呼び出したかったのは自身のメソッドではなく
to call the display method of the Question class. So my difficulty is that I
Questionクラスのdisplayメソッドです 問題なのはdisplayというメソッドが
have two methods called display in the Superclass and in the Subclass. And they
同じ名前でスーパークラスとサブクラスの 両方にあるということです
have the same name. That's exactly what always happens when you overwrite a
メソッドをオーバーライドする際よく起きます
method. Now, there's a special syntax for invoking the Superclass method and it
スーパークラスのメソッドを呼び出すための 特別な構文があります
looks like that. You simply say super.display. Go ahead and give that a try and
これが例文です 単にsuper．display（）と書きます
fix up the display method.
ではdisplayメソッドを修正してください
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