多选题Which two statements are true about the hashCode method？（）AThe hashCode method for a given class can be used to test for object equality and object inequality for that class.BThe hashCode method is used by the java.util.SortedSet collection class to or

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Which two statements are true about the hashCode method？（）

The hashCode method for a given class can be used to test for object equality and object inequality for that class.

The hashCode method is used by the java.util.SortedSet collection class to order theelements within that set.

The hashCode method for a given class can be used to test for object inequality， but NOT object equality， for that class.

The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution.

The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.

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第1题

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第2题

Which two statements about the open and shared key wireless-authentication methods are true？（）A、shared key authentication is considered more secure than open authenticationB、shared key authentication is considered less secure than open authenticationC、if the WEP keys do not match using the open authentication method， the client will not authenticate， associate， and transfer dataD、if the WEP keys do not match using the open authentication method， the client will still be able to authenticate and associate， but will not transfer dataE、if the WEP keys do not match using the open authentication method， the client will still be able to authenticate， associate， and transfer data

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第3题

Which two statements are true regarding the return values of property written hashCode and equals methods from two instances of the same class？（）A、 If the hashCode values are different， the objects might be equal.B、 If the hashCode values are the same， the object must be equal.C、 If the hashCode values are the same， the objects might be equal.D、 If the hashCode values are different， the objects must be unequal.

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第4题

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.

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第5题

Which two statements are true about using the isUserInRole method to implement security in a Java EEapplication？（）A、It can be invoked only from the doGet or doPost methods.B、It can be used independently of the getRemoteUser method.C、Can return "true" even when its argument is NOT defined as a valid role name in the deployment descriptor.D、Using the isUserInRole method overrides any declarative authentication related to the method in which it is invoked.

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第6题

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第7题

Which two statements are true about precedence values in policy?（） (Choose two.)A、1 is the default precedence.B、A lower number is preferred.C、A higher number is preferred.D、100 is the default precedence.

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Which two statements are true about the hashCode method？（）

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