在java中完成外部python命令的运行之前，什么都不会发生

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ExecutePythonScript {
    public static void main(String[] args) {
        ProcessBuilder processBuilder = new ProcessBuilder("python", "path/to/your_script.py");

        try {
            Process process = processBuilder.start();

            // 处理标准输出
            StreamGobbler outputGobbler = new StreamGobbler(process.getInputStream());
            outputGobbler.start();

            // 处理错误输出
            StreamGobbler errorGobbler = new StreamGobbler(process.getErrorStream());
            errorGobbler.start();

            int exitCode = process.waitFor();
            System.out.println("Process exited with code " + exitCode);

        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }

    private static class StreamGobbler extends Thread {
        private InputStream inputStream;

        public StreamGobbler(InputStream inputStream) {
            this.inputStream = inputStream;
        }

        @Override
        public void run() {
            try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
                String line;
                while ((line = reader.readLine()) != null) {
                    System.out.println(line);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}