多項(xiàng)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）

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單項(xiàng)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；

單項(xiàng)選擇題

Which statement is true about the set variable on line 12？（）

A.The set variable contains all six elements from the coll collection， and the order is guaranteed to be preserved.
B.The set variable contains only three elements from the coll collection， and the order is guaranteed to be preserved.
C.The set variable contains all six elements from the coll collection， but the order is NOT guaranteed to be preserved.
D.The set variable contains only three elements from the coll collection， but the order is NOT guaranteed to be preserved.

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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？（）

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

Which statement is true about the set variable on line 12？（）

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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？（）

Which statement is true about the set variable on line 12？（）