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//Written by Ira Snyder
//11-03-2004

import java.util.LinkedList;

class Queue {
    private LinkedList list;

    public Queue( ) { list = new LinkedList(); } //create an empty queue
    
    //put the item at the back of the queue
    public void enqueue( Object o ) { 
        if( list.isEmpty() ) { list.add(o); }
        else { list.addLast(o); } 
    }
    
    //remove the item from the front of the queue
    public Object dequeue() { return list.removeFirst(); }

    //check if the queue is empty
    public boolean isEmpty() { return list.isEmpty(); }
}