单选题11. public void addStrings(List list) {  12. list.add(”foo”);  13. list.add(”bar”);  14. }  What must you change in this method to compile without warnings?()A add this code after line 11: list = (List) list;B change lines 12 and 13 to: list.add(”foo”); list.add(”bar”);C change the method signature on line 11 to: public void addStrings(List extends String list) {D change the method signature on line 11 to: public void addStrings(List super String list) {E No changes are necessary. This method compiles without warnings.

单选题
11. public void addStrings(List list) {  12. list.add(”foo”);  13. list.add(”bar”);  14. }  What must you change in this method to compile without warnings?()
A

 add this code after line 11: list = (List) list;

B

 change lines 12 and 13 to: list.add(”foo”); list.add(”bar”);

C

 change the method signature on line 11 to: public void addStrings(List< extends String> list) {

D

 change the method signature on line 11 to: public void addStrings(List< super String> list) {

E

 No changes are necessary. This method compiles without warnings.


参考解析

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