Question

我在某些课程中说ClassCastException和界面MarketplaceBasicProductList课程时，我正在获得IMarketplaceProductList - 为什么？

public static IMarketplaceProductList createMarketplaceBasicProductList(Table basicInfoTable) {
        ArrayList list = new ArrayList();
        if (basicInfoTable != null) {
            for (int i = 1; i <= basicInfoTable.getRowCount(); i++) {
                IMarketplaceBasicProduct product = createMarketplaceBasicProduct(basicInfoTable, i);
                list.add(product);
            }
        }
        return (IMarketplaceProductList) new MarketplaceBasicProductList(list);
    }

其他细节是：

1

 public interface IMarketplaceProductList extends Serializable {

    public int getProductCount();
    public IMarketplaceBasicProduct getProductMKPInfo(int index);

}

public class MarketplaceBasicProductList extends AbstractProductList {..............
public abstract class AbstractProductList implements IProductList {.............

我还需要在这里添加实现IMarketplaceProductList吗？

public interface IMarketplaceBasicProduct extends Serializable {...获取MarketplaceBasicProduct函数的方法..

5。public class MarketplaceBasicProduct extends BasicProduct implements IMarketplaceBasicProduct, IGenericProductFields {

public class BasicProduct extends AbstractProduct {

7。public abstract class AbstractProduct extends AbstractGenericProduct implements IProduct {

我还需要在这里添加实现IMarketplaceBasicProduct吗？

Answer 1

由于您的课程ClassCastException 不是 MarketplaceBasicProductList，您将获得IMarketplaceProductList。

MarketplaceBasicProductList extends AbstractProductList implements IMarketplaceProductList

从您拥有的结构来看，AbstractProductList对于每种类型的产品列表都是通用的，IMarketplaceProductList将包含MarketplaceBasicProductList的特定方法，因此只有MarketplaceBasicProductList将实施IMarketplaceProductList

此外，我觉得IMarketplaceProductList将在IProductList之上和之上提供功能，因此IMarketplaceProductList定义应该是这样的：

public interface IMarketplaceProductList extends IProductList {

}

接口期间的java classcastexception和一些类的转换

其他细节是：

1 个答案: