高手们呀！！为什么process的waitFor不等呀!!!

为什么他这个 process.waitFor();不等cmd的命令走完才执行下边的代码额！！！怎么才能让他等呀! String s = "net use \\\\10.10.10.1" + "\\bak \"cqjs\" /user:guest";
Process process = Runtime.getRuntime().exec("cmd /c start " + s);
//等待外部程序运行完在往下走
try {
process.waitFor();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}process