deque implementation in java using arrays

certainly! a deque (double-ended queue) is a linear data structure that allows insertion and deletion of elements from both ends. it is a versatile data structure that can be used as a queue or a stack.

deque implementation using arrays in java

in this tutorial, we will create a simple implementation of a deque using a dynamic array. we'll support basic operations such as adding and removing elements from both the front and back of the deque.

key operations

1. **add to front**: insert an element at the front of the deque.
2. **add to back**: insert an element at the back of the deque.
3. **remove from front**: remove an element from the front of the deque.
4. **remove from back**: remove an element from the back of the deque.
5. **peek front**: get the element at the front without removing it.
6. **peek back**: get the element at the back without removing it.
7. **check if empty**: check if the deque is empty.
8. **get size**: get the number of elements in the deque.

implementation

here's a simple implementation of a deque using arrays in java:

explanation

1. **initialization**: the `deque` class initializes an array of a given capacity, along with pointers for the front and rear, and a size counter.

2. **adding elements**: the `addfront` and `addback` methods insert elements at the respective ends. we handle wrapping around using modulo arithmetic to allow for a circular array.

3. **removing elements**: the `removefront` and `removeback` methods remove elements from the respective ends, updating the pointers and size accordingly.

4. **peeking**: the `peekfront` and `peekback` methods return the element at the front and back without removing them.

5. **size and empty check**: the `getsize` method returns the number of elements, while `isempty` checks if the deque is empty.

conclusion

this implementation demonstrates a basic deque using arrays in java. it can be further enhanced with dynamic resizing, error handling, and additional features based ...

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