多項選擇題

Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）

A.The class implements java.lang.Comparable.
B.The class implements java.util.Comparator.
C.The interface used to implement sorting allows this class to define only one sort sequence.
D.The interface used to implement sorting allows this class to define many different sort sequences.

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多項選擇題

A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap.
Which two methods should be overridden to assure that Key works correctly as a key？（）

A.public int hashCode（）
B.public void hashCode（）
C.public int compareTo（Object o）
D.public boolean equals（Object o）
E.public boolean compareTo（Key k）

單項選擇題

What is the appropriate definition of the hashCode method in class Person？（）

A.return super.hashCode（）；
B.return name.hashCode（） + age * 7；
C.return name.hashCode（） + comment.hashCode（） / 2；
D.return name.hashCode（） + comment.hashCode（） / 2- age * 3；

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Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）

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A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

What is the appropriate definition of the hashCode method in class Person？（）

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Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）

A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap.
Which two methods should be overridden to assure that Key works correctly as a key？（）

What is the appropriate definition of the hashCode method in class Person？（）