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47 lines
1.6 KiB
47 lines
1.6 KiB
/**
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* File: deque.java
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* Created Time: 2022-11-25
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* Author: krahets (krahets@163.com)
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*/
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package chapter_stack_and_queue;
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import java.util.*;
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public class deque {
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public static void main(String[] args) {
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/* Initialize double-ended queue */
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Deque<Integer> deque = new LinkedList<>();
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deque.offerLast(3);
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deque.offerLast(2);
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deque.offerLast(5);
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System.out.println("Double-ended queue deque = " + deque);
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/* Access element */
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int peekFirst = deque.peekFirst();
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System.out.println("Front element peekFirst = " + peekFirst);
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int peekLast = deque.peekLast();
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System.out.println("Back element peekLast = " + peekLast);
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/* Element enqueue */
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deque.offerLast(4);
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System.out.println("Element 4 enqueued at the tail, deque = " + deque);
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deque.offerFirst(1);
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System.out.println("Element 1 enqueued at the head, deque = " + deque);
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/* Element dequeue */
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int popLast = deque.pollLast();
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System.out.println("Deque tail element = " + popLast + ", after dequeuing from the tail" + deque);
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int popFirst = deque.pollFirst();
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System.out.println("Deque front element = " + popFirst + ", after dequeuing from the front" + deque);
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/* Get the length of the double-ended queue */
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int size = deque.size();
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System.out.println("Length of the double-ended queue size = " + size);
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/* Determine if the double-ended queue is empty */
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boolean isEmpty = deque.isEmpty();
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System.out.println("Is the double-ended queue empty = " + isEmpty);
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}
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}
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