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；

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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.

單項(xiàng)選擇題

Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）

A.Set set = new TreeSet（）；
B.Set set = new HashSet（）；
C.Set set = new SortedSet（）；
D.List set = new SortedList（）；
E.Set set = new LinkedHashSet（）；

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

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

Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）

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

Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）