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console.scala
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// scala.xmlのインポート | |
scala> import scala.xml._ | |
import scala.xml._ | |
// scala.xml.transformのインポート | |
scala> import transform._ | |
import transform._ | |
// scala.collection.mutableパッケージのHashMapをインポート | |
scala> import scala.collection.mutable.HashMap | |
import scala.collection.mutable.HashMap | |
// 複数のオブジェクトやクラスのインポート | |
scala> import scala.collection.immutable.{TreeMap, TreeSet} | |
import scala.collection.immutable.{TreeMap, TreeSet} | |
// インポートしたクラスに別の名前をつける | |
scala> import scala.util.parsing.json.{ JSON => JsonParser } | |
import scala.util.parsing.json.{JSON=>JsonParser} | |
scala> JSON | |
<console>:19: error: not found: value JSON | |
JSON | |
^ | |
scala> JsonParser | |
res2: scala.util.parsing.json.JSON.type = scala.util.parsing.json.JSON$@6a0f0c67 | |
// scalaのクラス定義 | |
scala> class Foo | |
defined class Foo | |
// Javaだと | |
public class Foo { | |
} | |
// インスタンス作成 | |
scala> new Foo | |
res3: Foo = Foo@5f95bffc | |
scala> new Foo() | |
res4: Foo = Foo@6a8fcfae | |
// コンストラクタで1つの引数(String)をとるBarクラスの定義 | |
scala> class Bar(name: String) | |
defined class Bar | |
// Barクラスのインスタンス生成 | |
scala> new Bar("Hello World") | |
res5: Bar = Bar@aad33f6 | |
// コンストラクタでの引数チェック | |
scala> class Baz(name: String) { | |
// 初期化処理 | |
if (name == null) throw new Exception("Name is null") | |
} | |
defined class Baz | |
// トレイト | |
scala> trait Dog | |
defined trait Dog | |
// トレイトの追加 | |
scala> class Fizz2(name: String) extends Bar(name) with Dog | |
defined class Fizz2 | |
// メソッド定義ありのトレイト | |
scala> trait Cat { | |
def meow(): String | |
} | |
defined trait Cat | |
scala> trait FuzzCat extends Cat{ | |
override def meow(): String = "Meeeeeow" | |
} | |
defined trait FuzzCat | |
scala> trait OtherThing { | |
def hello() = 4 | |
} | |
defined trait OtherThing | |
scala> class Yep extends FuzzCat with OtherThing | |
defined class Yep | |
scala> (new Yep).meow() | |
res6: String = Meeeeeow | |
scala> (new Yep).hello() | |
res7: Int = 4 |
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