How to use @Repeatable in java

In Java8, through @Repeatable, the same class can be annotated multiple times.

1. Use annotation containers.

@Hints({@Hint("hint1"), @Hint("hint2")})
class Person {}

2. Use repeatable comments. The Java compiler can automatically set @Hint internally. This is important when reflexive reading of annotation information is required.

@Hint("hint1")
@Hint("hint2")
class Person {}

What collection classes are there in Java?

Collections in Java are mainly divided into four categories:

1. List list: ordered, can Repeated;

2. Queue queue: ordered, repeatable;

3. Set collection: non-repeatable;

4. Map mapping: unordered, key Unique, value is not unique.

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