getDownloadUrl()；是否出现错误(无法解析符号)？

import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

public class StorageExample {
    public static void main(String[] args) {
        // 初始化 Firebase Storage
        FirebaseStorage storage = FirebaseStorage.getInstance();
        StorageReference storageRef = storage.getReference();

        // 创建一个文件引用
        StorageReference fileRef = storageRef.child("path/to/file.jpg");

        // 获取下载 URL
        fileRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {
                String downloadUrl = uri.toString();
                System.out.println("Download URL: " + downloadUrl);
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception exception) {
                System.out.println("Error getting download URL: " + exception.getMessage());
            }
        });
    }
}