Item27: Eliminate unchecked warnings

참고자료

• oracle > Java Tutorials > Generic > Raw Types > # Unchecked Error Messages

Eliminate every unchecked warning that you can.

unchecked warning

• 컴파일러가 타입안정성을 보장할 수 없는 코드에 대해서 발생시키는 경고

• If you can’t eliminate a warning, but you can prove that the code that provoked the warning is typesafe, then (and only then) suppress the warning with an @SuppressWarnings("unchecked") annotation
• Always use the SuppressWarnings annotation on the smallest scope possible.
• Every time you use a @SuppressWarnings("unchecked") annotation, add a comment saying why it is safe to do so.

java.util.ArrayList 의 예시

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• https://velog.io/@bedshanty/자바의-ArrayList가-제네릭-타입-E가-아닌-Object를-저장하는-이유

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