Errors - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  16.7K views 57 likes 3 dislikes   23 Feb 2015
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When you did your programming with Sarah, it's quite possible that some things went wrong and you got some nasty error messages. When you learn a new
プログラミングをする際にうまくいかなくて うるさいエラーメッセージが出ることがあります
langauge, be it a human language or a programming language, errors are a fact
語学でもプログラミング言語でも 新しい言語を学ぶ際にエラーはつきものです
of life. Let me show you some common errors so that you can recognize and fix
自分で対応できるように よくあるエラーを紹介します
them. Here's a typical error. Have a quick look and see if you can tell which
こちらは典型的なエラーです ぱっと見て間違いが分かりますか？
part is wrong. That can't be right, the terminal window object was system.out not system.ouch. Let's see what happens if one makes such an error. You may
この端末画面は本来system．out．であって system．ouch．ではありません これがエラーの原因になっているとしたら どうなるでしょう
want to work along with me here in Blue Jay. Open the errors project and open
BlueJでerrorsというプロジェクトを開いて Error1を見ましょう
error 1. Here is the error. Let's compile and the compiler, the program that translate Java into lower-level code complains and says it has no idea what the
エラーがあります　コンパイルしましょう コンパイラすなわちJavaから低レベルコードへ 変換するプログラムがouchを認識していません
variable ouch is. The compiler knows system.out, it doesn't know system.ouch.
コンパイラはsystem．out．は知っていますが System．ouch．は知りません
Such an error is called a compile time error because it's found when you
コンパイルする時に出るエラーなので コンパイル時エラーと呼ばれています
compile. Some people call it a syntax error because there's something wrong
シンタックスエラーと呼ぶ人もいます 構文に問題があるエラーだからです
with the syntax of this statement here. As you can imagine there are lots of
シンタックスエラーは頻繁に起こり得ます
syntax errors you could make. You might forget the semicolon. You might forget
セミコロンや引用符を忘れたり
one of these quotation marks or both. You might forget one of these dots. Any
ドットを忘れたりしても起こりますからね
time you do that the compiler will complain and you just fix that particular
どの場合にもコンパイル時にエラーが出ますので エラーを特定して修正し再コンパイルします
error and recompile. It happens to the best of us. Now here we have a different
誰でも経験するエラーです
kind of error, again have a look and see if you can guess. The programmer
今度は先ほどとは違うタイプのエラーです 探してみてください
misspelled world, let's see what happens in this case. When you compile,
プログラマがスペルミスをした場合 どうなるでしょうか
there's no error, the compiler doesn't know English. And it has no idea that
コンパイラは英語を知りませんので コンパイル時にはエラーが出ません
this part has been misspelled. We can run the program and it runs. It just does
プログラムは実行できますが 間違ったことを実行します
the wrong thing. When a program compiles and runs but it produces the wrong
プログラムはコンパイルして実行しますが 間違ったアウトプットになります
output, then that's called a run time error. Some people call it a logic error because there's something wrong with the logic of the program not just it's
これをランタイムエラーと言います 構文ではなくプログラムの論理に 問題があるため論理エラーとも呼ばれます
syntax. Now have a look at this statement, it also has an error. What do you
こちらをご覧下さい　ここにもエラーがあります
think will happen when you try to compile and run a program containing this
この命令文を含むプログラムをコンパイルし 実行しようとするとどうなると思いますか
statement? Do you think it doesn't even compile? Do you think that it compiles
コンパイルできないでしょうか
and runs but then it prints the wrong value? Like in this case. Or will it
コンパイルして実行はできるが 間違った値が表示されるでしょうか
compile and run and then print an error message? Or will your keyboard melt
もしくはコンパイルし実行すると エラーメッセージが出るでしょうか
into a puddle of plastic? If you have BlueJ open right now, just give it a quick try.
それともキーボードが溶けてプラスチックの塊に？ BlueJ を開いて試してみましょう
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