predefined annotation

predefined annotations 分成两种类型的注解

1. annotation types used by the Java Language
2. annotation that apply to other annotations

Annotation Types Used by the Java Language

@Deprecated
@Override
@SuppressWarnings
@SafeVarargs
@FunctionalInterface

Annotations That Apply to Other Annotations

@Retention
@Documented
@Target
@Inherited
@Repeatable