• 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
  • lateinitで宣言時に初期化する必要がなくなるがnullに似たようなエラーが出る恐れがある
  • セカンダリコンストラクタはプライマリコンストラクタを呼ばないとコンパイルエラーになる
  • Class宣言時に class classname {} のように()を省略すればプライマリコンストラクタが存在しないことになるので、プライマリコンストラクタを呼ばないセカンダリコンストラクタを定義できる
  • 文字列リテラルの中に"${式}"の形で変数や式を直接埋め込める




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