Functions that take collection parameters should take the generic parameter. E.g. don’t do this:
public void process(ArrayList list);
do this instead:
public void process(List list);
This avoids putting unnecessary requirements on the parameter. In particular, you can do these:
thing.processList(Collections.EMPTY_LIST);
thing.processList(Collections.singletonList(item));
LinkedList linkedList = getLinkedList();
thing.processList(linkedList);
instead of having to do these:
thing.processList(new ArrayList());
ArrayList list = new ArrayList(1);
list.add(item);
thing.processList(list);
LinkedList linkedList = getLinkedList();
thing.processList(new ArrayList(linkedList));
Of course. This don’t just apply to collections but potentially to any class. This is the rule #1 of OO Design Patterns.
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