To retain the order of insertion, LinkedHashSet is used.
Example:
Set set = new LinkedHashSet();
// Add some elements
set.add("1"); set.add("2"); set.add("3"); set.add("2");
// List the elements
for (Iterator it=set.iterator(); it.hasNext(); )
{
Object o = it.next();
} // [1, 2, 3]
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