（多选题）
Which four statements are true？（）
AHas-a relationships should never be encapsulated.
BHas-a relationships should be implemented using inheritance.
CHas-a relationships can be implemented using instance variables.
DIs-a relationships can be implemented using the extends keyword.
EIs-a relationships can be implemented using the implements keyword.
FAn array or a collection can be used to implement a one-to-many has-a relationship.
正确答案
答案解析
略
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