java 写个控制台程序 在linux java控制台怎么用

String shell = "ping www.baidu.com";//需要执行的命令
BufferedReader br = null;
try {
    Process p = Runtime.getRuntime().exec(shell);//调用控制台执行shell
    br = new BufferedReader(new InputStreamReader(p.getErrorStream()));//获取执行后出现的错误；getInputStream是获取执行后的结果

    String line = null;
    StringBuilder sb = new StringBuilder();
    while ((line = br.readLine()) != null) {
        sb.append(line + "\n");
        System.out.println(sb);
    }
    System.out.println(sb);//打印执行后的结果
} catch (Exception e) {
    e.printStackTrace();
}
finally
{
    if (br != null)
    {
        try {
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}