如何从其他Java应用程序关闭Java应用程序？

Question

我使用以下代码运行应用程序：

private void RunApp2() throws IOException
{
    StringBuilder sb = new StringBuilder();
    String filePath  = System.getProperty("user.dir");
    String jarfile = filePath + "\\MyAppV2.jar";

    File f = new File(jarfile);
    if(f.exists() && !f.isDirectory()) {
        // do something
    }
    else
    {
        AreThereProblem = true;
    }

    try { // jarname arguments has to be saperated by spaces
        Process process = Runtime.getRuntime().exec("cmd.exe start /C java -jar \""+jarfile + "\"");

        //.exec("cmd.exe /C start dir java -jar "+jarfile+" "+name+" "+id+" dir");
        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream ()));
        String line = null;
        while ((line = br.readLine()) != null){
            sb.append(line).append("\n");
        }
        System.out.println("Console OUTPUT : \n"+sb.toString());
        //process.destroy();
    }catch (Exception e){
        lblInformation.setText(e.getMessage());
    }
}

但是如果应用程序在我再次运行之前已经运行，我该如何关闭MyAppV2.jar应用程序呢？