problem in generics(sun accesibility test)

[manny singh]

 
1. import java.util.*;
2. class AddStuff {
3.   public static void main(String [] args) {
4.     TreeSet<String> s = new TreeSet<String>();
5.     s.add("one");
6.     s.add("two");
7.     // insert code here
8.     for(String s2 : sorted)
9.       System.out.print(s2 + " ");
10.   }
11. }
 

And the four code fragments:


s1. SortedSet sorted = s.tailSet(s.first());
s2. SortedSet<String> sorted = s.tailSet(s.first());
s3. SortedSet sorted = (SortedSet)s.tailSet(s.first());
s4. SortedSet sorted = (SortedSet<String> s.tailSet(s.first());

Which, inserted independently at line 7, will compile?

only s1
only s2
only s2 and s3
only s2 and s4
only s2, s3, and s4
only s1, s2, s3, and s4

[Jesper de Jong]

JavaRanch is not just an answering machine.

What do you think the answer should be yourself, and why? Is there something specific about the question that you don't understand? If so, what?

[Irina Goble]

Hint: look at the for loop.