java 收藏についてDequeSample

Posted 2021-05-08

class DequeSample {
	public static void main(String[] args) {
		Deque<String> deq = new LinkedList<String>();
		deq.offerFirst("1");
		deq.offerFirst("2");
		deq.offerFirst("3");
		System.out.println(deq);
		System.out.println("peekLast() : " + deq.peekLast());
		System.out.println(deq);
		System.out.println("pollLast() : " + deq.pollLast());
		System.out.println(deq);

		Deque<String> deq2 = new LinkedList<String>();
		deq2.offer("1"); // deq2.offerLast("1");と同じ
		deq2.offer("2");
		deq2.offer("3");
		System.out.println(deq2);
		System.out.println("peek()はpeekFirst()と同じ : " + deq2.peek());
		System.out.println(deq2);
		System.out.println("poll()はpollFirst()と同じ : " + deq2.poll());
		System.out.println(deq2);
		System.out.println("element()はgetFirst()と同じ : " + deq2.element());
		System.out.println(deq2);
		
		Deque<String> deq3 = new ArrayDeque<String>();
		deq3.push("a");
		deq3.push("b");
		System.out.println(deq3);
		System.out.println(deq3.pop());
	}
}