JavaTip : Use set as duplicate remover

1. You fired a query and got results which have duplicates like
List<Category> resultWithDuplicates = getSession().createQuery(“select * from tablename”);

2. Way to remove duplicate is
Set<Category> duplicateRemover  = Sets.newLinkedHashSet(resultWithDuplicates );
duplicateRemover.addAll(individualWBTCategories);

3. Can convert set into list by using
resultWithDuplicates = Lists.newArrayList(duplicateRemover);
return categories;

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