String Methods - Intro to Java Programming Udacity English Japanese

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The best way to become familiar with objects is to use lots of them. Here, we

オブジェクトに慣れる一番の方法は多くのオブジェクトを使うことです

will look at strings and we will do it in three ways. With BlueJ objects, with

ここでは文字列を3つの方法で学んでいきます BlueJオブジェクトを使う方法や

Java code, and with another nifty tool called the code pad. In the code pad, as

Javaコードを使う方法そしてコードパッドという便利なツールを使う方法です

you'll see in a minute, I can type in code and have it executed right away

このあとすぐにお見せしますがコードパッドではコンパイルしたり

without having to compile anything, or without having to click on the bubbles.

バブルをクリックしたりせずにコードを入力して実行させることができます

The code pad is so nifty that it's a shame that it's hidden, to reveal it,

便利なコードパッドが隠れているので表示させましょう

select View and Show Code Pad. And then they make it so small, which is also a

ViewからShow Code Padを選びます最初はこのように小さく表示されるので

shame. Let's make it much, much bigger. In the code pad I can write regular

もっと大きく広げましょうコードパッドでは通常のJavaの命令文が書けます

Java statements. Here I declare a variable, here I have a print statement. And

変数を宣言したりprint文を表示したりします

as soon as I hit the Enter key, it gets executed. You see a window pops up that

そしてEnterキーを押せばすぐに実行されますウィンドウが出てきて

has the output. But what's even better, any value that I type in here gets

出力もされています　しかしさらにいいことはここに入力した値はどんなものでも

displayed right away. Let me show you. I type river.length, and the answer 11

すぐに表示されることです　実際にやってみますね river．lengthと入力しEnterキーを押すと

is displayed as soon as I hit the Enter key. It's important that you don't type

答えの11がすぐに表示されましたここでセミコロンは入力しません

a semi-colon because otherwise the code pad thinks that you have a statement

入力するとコードパッドが上にあるような命令文ととらえてしまうからです

like up here. No semicolon tells it that it should immediately print the value

セミコロンがなければ記述されたコードの値をすぐに表示しなければなりません

of the code that you write. Here I type the name of the variable without a

ここに変数の名前をセミコロンをつけずに入力しました

semicolon, and it's printed the string Mississippi. And to the left, I have a

するとMississippiという文字列が表示されますその左には

little blob that I can drag into the workbench. Here it goes. I drop it into

小さなBLOBがありワークベンチの中にこのようにドラッグできます

the workbench. Now I'm supposed to give it a name. I'll give it the same name,

これに名前をつけなければなりません変数と同じ名前のriverにします

that the variable has river. And over here I have a familiar BlueJ blob. That I

ここでもおなじみのBlueJ BLOBが出ました

can manipulate in the usual way. I can right click on it, and now the string

いつものように操作してみましょう右クリックして出てくるのは

class has many, many methods, but I want to call length. When I select the

非常に多くのメソッドを持つStringクラスですが

length method I get the answer 11. So I can get the same answer in two

lengthメソッドを選ぶと答えは11になり 2つの方法で同じ答えが得られたことになります

different ways. Which one is better? It really depends. Sometimes I prefer to

どちらがいい方法でしょう状況によりますが私は時々BlueJアイコンを使って

use the BlueJ bubbles for quick experimentation, because you can't really make

タイプミスをしていないか簡単に確認していますし

any typos. Sometimes I prefer to use the code pad. Because it's just easier to

コードパッドを使う方が便利な時もありますというのも簡単に入力できますし

type in, maybe to copy and paste in, what you want. Both of those are great for

おそらくコピー＆ペーストなど何でも好きなことを簡単にできます

experimenting with classes and objects, and to just find out what happens when

どちらもクラスやオブジェクトを試したりメソッドを呼び出した時

you call a particular method. You should try them both and see which one you

どうなるか確認するには最適の方法です両方試してみてください

like better. Of course for more hardcore programming. For writing a program

もちろんもっと本格的なプログラミングでは

that gets repeated over and over again, one wants to write an actual Java class

同じプログラムの記述を何度も繰り返すので mainメソッドを使って実際のJavaクラスを

with a main method. In that case, as you know, you right click on the empty

書く方がいいかもしれません　その場合ご存じのように空白のスペースで右クリックをして

space, make a new class, right click, open the editor. And start typing. Then

新規クラスを作成し右クリックでエディタを開き入力を始めます

you put your code into the main method. Here I wrote a couple of lines of code

mainメソッドにコードを入力しますこの文字列の長さを出すために

that let me compute the length of this string. You compile. You run. And you

何行かコードを書いてみましたコンパイルして実行させると答えが出ました

get the answer. That's more work at first, and it'll pay off when you write a

最初は作業が多いですがさらに長いプログラムを書く際に役立ちます

longer program. For short explorations, the object bubbles and the code pad are

ちょっと試したい時にオブジェクトアイコンとコードパッドは最強です

hard to beat. So go ahead. Fire up BlueJ and work along with Sara to explore

どんどん使ってみましょう BlueJを起動してStringクラスとそのメソッドを

the string class and its methods.

サラと一緒に学習しましょう

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