The collections framework defines several interfaces.
| Interface | Description |
|---|---|
| Collection | Enables you to work with groups of objects; it is at the top of the collections hierarchy |
| List | Extends Collection to handle sequences (lists of objects) |
| Set | Extends Collection to handle sets, which must contain unique elements |
| SortedSet | Extends Set to handle sorted sets |
The standard collection classes are summarized in the following table:
| Class | Description |
|---|---|
| AbstractCollection | Implements most of the Collection interface. |
| AbstractList | Extends AbstractCollection and implements most of the List interface. |
| AbstractSequentialList | Extends AbstractList for use by a collection that uses sequential rather than random access of its elements. |
| LinkedList | Implements a linked list by extending AbstractSequentialList. |
| ArrayList | Implements a dynamic array by extending AbstractList. |
| AbstractSet | Extends AbstractCollection and implements most of the Set interface. |
| HashSet | Extends AbstractSet for use with a hash table. |
| LinkedHashSet | Extends HashSet to allow insertion-order iterations. |
| TreeSet | Implements a set stored in a tree. Extends AbstractSet. |
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