• コンストラクタ内でフィールドの宣言と初期化する
  • クラス宣言はdefaultでfinalなので、継承する場合はopen修飾子をつける
  • javaではpublicなクラスは一つのファイルに一つだけにするべきというのがあったが、kotlinではその制限はないので一つのファイルにまとめた




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