java实现操作dos命令怎么弄

package com;
import java.io.InputStream;
public class cmd {
            public static void main(String[] args) {
            String path = "D:\\cmd.bat";
            Runtime run = Runtime.getRuntime();
            try {
                //run.exec("cmd /k shutdown -s -t 3600");
                Process process = run.exec("cmd.exe /k start " + path);
                InputStream in = process.getInputStream();
                while (in.read() != -1) {
                    System.out.println(in.read());
                }
                in.close();
                process.waitFor();
            } catch (Exception e) {
                e.printStackTrace();
            }
    }     
}