java - 类型错误使用 Google 表格 api 将列分配给 Java 中的 ValueRange 变量进行 append ？

Question

“java.lang.String 无法转换为 java.lang.Object”

 public class SheetsQuickstart {
    private static final String APPLICATION_NAME = "Google Sheets API Java Quickstart";
    private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
    private static final String TOKENS_DIRECTORY_PATH = "tokens";

    /**
     * Global instance of the scopes required by this quickstart.
     * If modifying these scopes, delete your previously saved tokens/ folder.
     */
    private static final List<String> SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY);
    private static final String CREDENTIALS_FILE_PATH = "/credentials.json";

    /**
     * Creates an authorized Credential object.
     * @param HTTP_TRANSPORT The network HTTP Transport.
     * @return An authorized Credential object.
     * @throws IOException If the credentials.json file cannot be found.
     */
    public ValueRange getValues(String spreadsheetId, String range, Sheets service) throws IOException {

        // [START sheets_get_values]
        ValueRange result = service.spreadsheets().values().get(spreadsheetId, range).execute();
        int numRows = result.getValues() != null ? result.getValues().size() : 0;
        System.out.printf("%d rows retrieved.", numRows);
        // [END sheets_get_values]
        return result;
    }
    private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
        // Load client secrets.
        InputStream in = SheetsQuickstart.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
        GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

        // Build flow and trigger user authorization request.
        GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
                HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
                .setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
                .setAccessType("offline")
                .build();
        return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
    }

    /**
     * Prints the names and majors of students in a sample spreadsheet:
     * https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit
     */
    public static void main(String... args) throws IOException, GeneralSecurityException {
        // Build a new authorized API client service.
        final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
        final String spreadsheetId = "1h6NmjAqRBV-Mg67VYJ6K7nuNKHDzhMB0dP-iTgXuaJM";
        final String range = "A1:E";
        Sheets service = new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
                .setApplicationName(APPLICATION_NAME)
                .build();


        ValueRange body = new ValueRange();
        body.setValues(
                Arrays.asList(
                        Arrays.asList("Row 1 Cell 1", "Row 1 Cell 2", "Row 1 Cell 3"),
                        Arrays.asList("Row 2 Cell 1", "Row 2 Cell 2", "Row 2 Cell 3")));

        AppendValuesResponse result =
                service.spreadsheets().values().append(spreadsheetId,"A1", body)
                        .setValueInputOption("RAW")
                        .setInsertDataOption("INSERT_ROWS")
                        .execute();
        System.out.printf("%d cells appended.", result.getUpdates().getUpdatedCells());


    }

我正在尝试这个 google 表格 api，我是 java 的新手。我不明白如何创建 valuerange 主体。在列的 append 主体中，我在

处收到类型错误

 ValueRange body = new ValueRange().setValues(
                Arrays.asList(
                        Arrays.asList("Row 1 Cell 1", "Row 1 Cell 2", "Row 1 Cell 3"),
                        Arrays.asList("Row 2 Cell 1", "Row 2 Cell 2", "Row 2 Cell 3")));

它抛出 Error:(104, 30) java: incompatible types: java.util.List< java.util.List< java.lang.String >> cannot be converted to java.util.List< java.util.列表 >我错过了创建类(class)吗？为什么会抛出这个错误。

Answer 1

将 String 更改为 Object。

ValueRange body = new ValueRange().setValues(
                Arrays.asList(
                        Arrays.asList((Object)"Row 1 Cell 1", (Object)"Row 1 Cell 2",(Object) "Row 1 Cell 3"),
                        Arrays.asList((Object)"Row 2 Cell 1",(Object) "Row 2 Cell 2", (Object)"Row 2 Cell 3")));