java - 获取方法的结果并将其保存到变量

有这样的代码，我将两个参数传递给输入并在控制台中获取此方法的结果，我需要将结果保存到变量中并将其传递给另一个方法该如何正确执行？请不要在编程方面与新手着急，我将很高兴为您提供帮助。屏幕方法的结果。

在此处输入图片说明

  public static String activation(String serialNumber, String keyName) throws IOException, InterruptedException, SQLException {
    LocalDate futureDate = LocalDate.now().plusMonths(12);
    String formattedDate = futureDate.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
    String[] command =
            {
                    "cmd",
            };
    Process p = Runtime.getRuntime().exec(command);
    //new Thread(new SyncPipe(p.getErrorStream(), System.err)).start();
    new Thread(new SyncPipe(p.getInputStream(), System.out)).start();
    PrintWriter stdin = new PrintWriter(p.getOutputStream());
    stdin.println("C:\\tdes_ecb.exe " + serialNumber + " " + keyName + " " + formattedDate);

    stdin.close();

    int returnCode = p.waitFor();
    String code = Integer.toString(returnCode);

    return code;
}

static class SyncPipe implements Runnable {
    public SyncPipe(InputStream istrm, OutputStream ostrm) {
        inputStream = istrm;
        outputStream = ostrm;

    }

    public void run() {
        try {


            final byte[] buffer = new byte[1024];
            for (int length = 0; (length = inputStream.read(buffer)) != -1; ) {
                outputStream.write(buffer, 0, length);


                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < buffer.length; i++) {
                    char c = (char) buffer[i];
                    sb.append(c);
                }
                String convertedString = sb.toString();

                key(convertedString);


            }


        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private final OutputStream outputStream;
    private final InputStream inputStream;
}

public void SyncPipe(InputStream inputStream, OutputStream outputStream) {
    this.inputStream = inputStream;
    this.outputStream = outputStream;
}

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