Discussion
Which line rests on a mistaken assumption?
import java.util.*;
public class Sample29
{
public static void main(String[] args)
{
Set<String> s = new HashSet<String>();
s.add("b"); s.add("a");
assert s.iterator().next().equals("a");
System.out.println(s);
}
}
Answer: A
A HashSet gives no ordering guarantee, so asserting which element comes first encodes an accident of the current implementation. It may hold today and stop holding on another JDK or after a resize. Ordering is asserted only on a type that promises it, such as TreeSet or LinkedHashSet.
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