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【Java】Dependency Injection 覚書

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Dependency Injectionの利点
・newしなくてもよくなる

@AllArgsConstructor
全メンバの値をセットする引数付きコンストラクタを自動生成する

@NoArgsConstructor
引数なしのコンストラクタを自動生成する

@RequiredArgsConstructor
finalのメンバの値をセットする引数付きコンストラクタを自動生成

@Compornent
インスタンスを Spring 管理下におくアノテーション。
レイヤに応じて@Controller@Service@Repositoryなどを使う。

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