List command = new ArrayList();
command.add(“cmd.exe”);
command.add(“/C”);
command.add(“RUNAS”);
command.add(“/user:domain\\userName”);
command.add(“\”D:\\someApp.exe arg1 arg2 arg3 arg4 arg5\”");
ProcessBuilder builder = new ProcessBuilder(command);
builder.directory(new File(“D:\\”));
builder.redirectErrorStream(true);
Process process = null;
String line;
OutputStream stdin = null;
InputStream stdout = null;
try {
    process = builder.start();
    stdin = process.getOutputStream();
    stdout = process.getInputStream();
    BufferedReader reader = new BufferedReader (new InputStreamReader(stdout));
    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(stdin));
    while ((line = reader.readLine()) != null) {
        System.out.println(“[Stdout] ” + line);
    }
    writer.write(“password”);
    writer.newLine();
    writer.flush();
    reader = new BufferedReader (new InputStreamReader(stdout));
    while ((line = reader.readLine()) != null) {
         System.out.println(“[Stdout] ” + line);
    }
    reader.close();
    int exit = process.waitFor();
    System.out.println(exit);
    } catch (IOException e) {
         e.printStackTrace();
    } catch (InterruptedException e) {
         e.printStackTrace();
    } finally {
         if (process != null) {
         process.destroy();
    }
}

Thread T=new Thread(new Runnable() {

            @Override
            public void run() {
                while(true)
                {
                    String input = scan.nextLine();
                    input += "\n";
                    try {
                        writer.write(input);
                        writer.flush();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }

            }
        } );
        T.start();