• kotlinでは複数のクラスを一つのファイルにまとめることが出来るのでまとめた
  • staticは無いのでcompanion objectブロック内で定義するとstaticのようになる
  • privateなコンストラクタの書き方
  • 初期化処理はinit{}ブロック内に書く
  • ==はjavaのEqualで、===がjavaの同一性の確認(==)になる




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