An ArrayList automatically expands as data is added.
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java.util.ArrayList allows for expandable arrays, and is basically the same as the older the Collections Vector class. An ArrayList has these characteristics:
An ArrayList automatically expands as data is added.
Access to any element of an ArrayList is O(1). Insertions and deletions are O(N).
An ArrayList has methods for inserting, deleting, and searching.
An ArrayList can be traversed using a foreach loop, iterators, or indexes.
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