Which of the following statements are true？（） 

• A、 The equals（） method determines if reference values refer to the same object.
• B、 The == operator determines if the contents and type of two separate objects match.
• C、 The equals（） method returns true only when the contents of two objects match.
• D、 The class File overrides equals（） to return true if the contents and type of two separate objects        match.