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Objects and Collections - Programming

Q1:

What will be the output of the program? 
TreeSet map = new TreeSet();
map.add('one');
map.add('two');
map.add('three');
map.add('four');
map.add('one');
Iterator it = map.iterator();
while (it.hasNext() ) 
{
    System.out.print( it.next() + ' ' );
}

A one two three four

B four three two one

C four one three two

D one two three four one

ANS:A - one two three four

TreeSet assures no duplicate entries; also, when it is accessed it will return elements in natural order, which typically means alphabetical.