1. AbstractCollection:
AbstractCollection implements most of the Collection interface.
2. AbstractList:
AbstractList extends AbstractCollection and implements most of the List interface.
3. AbstractSequentialList:
AbstractSequentialList extends AbstractList for use by a collection that uses sequential rather than random access of its elements.
4. AbstractSet:
AbstractSet extends AbstractCollection and implements most of the Set interface.
5. AbstractMap:
AbstractMap implements most of the Map interface.
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