Creating a Set That Retains Order-of-Insertion
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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