What inserted at line 39, will sort the keys in the props HashMap?()
A.Arrays.sort(s); B.s = new TreeSet(s); C.Collections.sort(s); D.s = new SortedSet(s);
单项选择题What is the result?()
A.2,1,0 B.2,1,1 C.3,2,1 D.3,2,2 E.Compilation fails. F.An exception is thrown at runtime.
单项选择题Given that the elements of a PriorityQueue are ordered according to natural ordering, and: What is the result?()
A.apple pear B.banana pear C.apple apple D.apple banana E.banana banana
多项选择题Which three code fragments, inserted independently at line 6, will compile?()
A.list.add("foo"); B.Object o = list; C.String s = list.get(0); D.list = new ArrayList<String>(); E.list = new ArrayList<Object>();
多项选择题Which two, inserted at line 11, will allow the code to compile?()
A.public class MinMax<?>{ B.public class MinMax<? extends Number>{ C.public class MinMax<N extends Object>{ D.public class MinMax<N extends Number>{ E.public class MinMax<? extends Object>{ F.public class MinMax<N extends Integer>{
A.0 B.1 C.2 D.3 E.4 F.Compilation fails. G.An exception is thrown at runtime.