在JAVA中使用Runtime类时如何更改stdin

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

public class ChangeStdinExample {
    public static void main(String[] args) {
        try {
            // 获取Runtime对象实例
            Runtime runtime = Runtime.getRuntime();
            
            // 执行系统命令
            Process process = runtime.exec("your_command_here");
            
            // 获取标准输入流
            InputStream inputStream = process.getInputStream();
            
            // 创建线程读取用户输入内容并写入标准输入流
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
                        String line;
                        while ((line = reader.readLine()) != null) {
                            process.getOutputStream().write((line + "\n").getBytes());
                            process.getOutputStream().flush();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
            
            // 输出命令执行结果
            BufferedReader outputReader = new BufferedReader(new InputStreamReader(inputStream));
            String outputLine;
            while ((outputLine = outputReader.readLine()) != null) {
                System.out.println(outputLine);
            }
            
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}