java - 仅键入接口(interface)方法

Question

我有这个界面

/**
 * Exports data provided by a {@link IDataProvider} as described by {@link IExportableColumn}s. This interface is used by
 * {@link ExportToolbar} to provide the export functionality.
 *
 * @author Jesse Long
 * @see ExportToolbar
 * @see IExportableColumn
 */
public interface IDataExporter
    extends IClusterable
{
    ...
    /**
     * Exports the data provided by the {@link IDataProvider} to the {@link OutputStream}.
     *
     * @param <T>
     *      The type of each row of data provided by the {@link IDataProvider}.
     * @param dataProvider
     *      The {@link IDataProvider} from which to retrieve the data.
     * @param columns
     *      The {@link IExportableColumn} to use to describe the data.
     * @param outputStream
     *      The {@link OutputStream} to which to write the exported data.
     * @throws IOException If an error occurs.
     */
    <T> void exportData(IDataProvider<T> dataProvider, List<IExportableColumn<T, ?, ?>> columns, OutputStream outputStream)
        throws IOException;
}

在实现此接口(interface)的类中是否有某种方式我可以将 T 键入特定的内容，我想确保 T 实现另一个接口(interface)？

Answer 1

<T extends MyRequisiteType> void exportData(IDataProvider<T> dataProvider, List<IExportableColumn<T,?,?>> columns, OutputStream outputStream) throws IOException;

为什么 IExportableColumn<T,?,?> 中有 2 个无界类型参数？当我在应用程序代码中看到这一点时，我总是感觉自己错过了一些东西。

您还可以使整个界面参数化，但从我看来，参数的数量需要相当大。至少 3 个。