Thread

    public static void runAndJoinThreads( List list )

    throws InterruptedException

    {

        Iterator itrList = list.iterator();

        while ( itrList.hasNext() ) {

            Thread t = itrList.next();

            t.run();

        }
        itrList = list.iterator();

        while ( itrList.hasNext() ) {

            Thread t = itrList.next();

            t.join();

        }

    }

Threadイッパイ立てて待たせとこうかと。。。