?? queue.java
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// Introduced in Chapter 4/** A first-in, first-out queue of Objects. */public interface Queue<E> { /** Add target to the back of this Queue. */ public void add(E target); /** Return true if this Queue is empty. */ public boolean isEmpty(); /** * Remove and return the front item from this Queue. * @throws EmptyStructureException if the Queue is empty. */ public E remove();}
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