用Java显示CMD窗口

我正在使用此代码启动.cmd文件:

try {
            String line;
            Process p = Runtime.getRuntime().exec(myPath + "\\punchRender.cmd");
            BufferedReader input =
                    new BufferedReader(new InputStreamReader(p.getInputStream()));
            while ((line = input.readLine()) != null) {
                System.out.println(line);
            }
            input.close();
        } catch (Exception err) {
            err.printStackTrace();
        }