Handout 3.2 - Collections-The Deque ADT.pdf

Handout 3.2 - Collections-The Deque ADT.pdf

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Kimani Njoroge. Collections: Deque Page 1 The Deque ADT Consider the Deque ADT: A deque is an abstract data type that is analogous to a double-ended queue. Elements are added/removed to/from either end. A deque allows us to add/remove from the front or the back of the queue at any time, but no modifications to the middle. It has the same advantages of a regular single-ended queue, but is a little more flexible in that it allows removal from the back of the queue and insertion at the front. An example of where we might use a deque is when we implement “ Undo ” operations in a piece of software. Each time we do an operation, we add it to the front of the deque . When we do an undo, we remove it from the front of the deque. Since undo operations usually have a fixed limit defined somewhere in the options (i.e., maximum 20 levels of undo), we remove from the back of the deque when the limit is reached. Typical methods for Deques are: addFirst(Object x) and addLast(Object x) Insert object x at the front (or back) of the deque.
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