Which four statements are true？（）A、Has-a relationships should never be encapsulated.B、Has-a relationships should be implemented using inheritance.C、Has-a relationships can be implemented using instance variables.D、Is-a relationships can be implemented using the extends keyword.E、Is-a relationships can be implemented using the implements keyword.F、An array or a collection can be used to implement a one-to-many has-a relationship.
Which four statements are true？（）
- A、Has-a relationships should never be encapsulated.
- B、Has-a relationships should be implemented using inheritance.
- C、Has-a relationships can be implemented using instance variables.
- D、Is-a relationships can be implemented using the extends keyword.
- E、Is-a relationships can be implemented using the implements keyword.
- F、An array or a collection can be used to implement a one-to-many has-a relationship.
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