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import java.util.Vector;

public class Queue{

private static Vector<Object> queue = new Vector<Object>();

public static void main(String[] args){

enqueue("a");

enqueue("b");

enqueue("c");

enqueue("d");

enqueue("e");

System.out.println(dequeue());

System.out.println(dequeue());

System.out.println(dequeue());

System.out.println(dequeue());

System.out.println(dequeue());

}

public static boolean empty(){

return queue.isEmpty();

}

public static Object dequeue(){

return queue.remove(0);

}

public static void enqueue(Object obj){

queue.add(obj);

}

}