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import java.util.*;

public class Main {

public static void main(String[] args) {

Queue<Integer> q = new LinkedList<>();

// 삽입(5) - 삽입(2) - 삽입(3) - 삽입(7) - 삭제() - 삽입(1) - 삽입(4) - 삭제()

q.offer(5);

q.offer(2);

q.offer(3);

q.offer(7);

q.poll();

q.offer(1);

q.offer(4);

q.poll();

// 먼저 들어온 원소부터 추출

while (!q.isEmpty()) {

System.out.println(q.poll());

}

}

}