* Description:

final class EventQueue

{

    LCDUIEvent first;

    LCDUIEvent last;

    EventQueue()

    {

    }

    synchronized void push(LCDUIEvent event)

    {

        event.next = null;

        if(isEmpty())

        {

            first = last = event;

        }

        else

        {

            last.next = event;

            last = event;

        }

    }

    synchronized LCDUIEvent pop()

    {

        if(isEmpty())

        {

            return null;

        }

        LCDUIEvent event = first;

        first = first.next;

        event.next = null;

        if(isEmpty())

        {

            last = null;

        }

        return event;

    }

    synchronized boolean isEmpty()

    {

        return first == null;

    }