多项选择题
Given: 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();
A. B. C. D.
A.Tea B.Coffee C.CoffeeTea D.Compilation fails