import java.util.LinkedList;
import java.util.Queue;
public class Main {
public static void main(String[] args) {
Queue<String> queue = new LinkedList<String>();
queue.add("A");
queue.add("B");
queue.offer("C");
queue.offer("D");
System.out.println("remove: " + queue.remove());
System.out.println("element: " + queue.element());
System.out.println("poll: " + queue.poll());
System.out.println("peek: " + queue.peek());
}
}
/*
remove: A
element: B
poll: B
peek: C
*/
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