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class TQueue {    private ArrayList<Sortable> queue;        public TQueue () {        queue = new ArrayList<Sortable>();    } // TQueue        public synchronized void orderedInsert (Sortable s) {        int i;        for (i = 0; i < queue.size(); i++)             if (s.compareTo(queue.get(i)) < 0)                queue.add(i, s);         if (i == queue.size())            queue.add(s);        return;    } // insert        public synchronized Sortable getFirstElementIfPreviousTo (int orderN) {        if (queue.size() != 0 && queue.get(0).getOrderNumber() <= orderN)            return queue.remove(0);        else            return null;    } // getOlderEventIndex    } // TQueueclass Evt implements Sortable {    private int time;    private String description;           public Evt (int time0, String description0) {        time = time0;        description = description0;    } // Evt        public String getDescription () {        return description;    } // getDescription        public int getTime () {        return time;    } // getTime        public int compareTo (Object o) {        return time - ((Evt)o).time;    } // compareTo        public int getOrderNumber () {        return time;    } // getOrderNumber        public String toString () {        return getClass().getName()+"[time="+time+", description="+description+"]";    } // toString} // Evtinterface Sortable extends Comparable {    public int getOrderNumber (); } // Sortable