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SpringBoot 2.xx의 Java 11과 SpringBoot 3.xx의 Java 17. 이를 비교합니다.. ............................................................................................................................................................................................................................. 📌 Java 11 ✅ 인터페이스에 private 메서드 추가 가능 이전에는 인터페이스에 선언된 모든 메서드가 암묵적으로 public 해당 메서드를 구현하는 구현 클래스에서도 반드시 public으로 선언했..