求教Runtime.exec如何同步

求教Runtime.exec怎么同步
Runtime   r   =   Runtime.getRuntime();
Process   p   =   r.exec( "cmd.exe   /c "   +   "   start     .\\batch.bat ");
try   {
        p.waitFor();
        System.out.println( "Run   to   here ");
        System.out.println( "Run   to   here   2222222 ");
}   catch   (InterruptedException   e)   {
        e.printStackTrace();
}
发现batch.bat还在跑， "Run   to   here "已经打出来了，
JavaDoc里说waitFor()方法会等到该子进程结束。
求教，调用外部shell时怎么同步


------解决方案--------------------
去掉 "start "