单项选择题

A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add(0, object), but does NOT need to support quick random access.
What supports these requirements?()

A.java.util.Queue
B.java.util.ArrayList
C.java.util.LinearList
D.java.util.LinkedList

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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

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)

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