多项选择题

Given:

Which two code fragments, inserted independently at line 5, will compile without warnings?()

A.public void addStrings(List list) {
B.public void addStrings(List<String> list) {
C.public void addStrings(List<? super String> list) {
D.public void addStrings(List<? extends String> list) {  B,C

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多项选择题
Given: 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 boolean equals(Key k)
C.public int compareTo(Object o)
D.public boolean equals(Object o)
E.public boolean compareTo(Key k)

单项选择题
Given: 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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