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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

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