DataOutputStream没有刷新

import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            FileOutputStream fos = new FileOutputStream("output.txt");
            DataOutputStream dos = new DataOutputStream(fos);

            dos.writeUTF("Hello, world!");
            dos.writeInt(42);

            // 刷新输出流以确保数据写入完整
            dos.flush();

            dos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}