接口和类转换过程中的java类异常
在转换某些类(比如MarketplaceBasicProductList )和接口IMarketplaceProductList类( -why )之间时，我得到了IMarketplaceProductList？
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);
}其他详情如下：
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{ .............
我需要在这里添加实现IMarketplaceProductList吗？
public interface IMarketplaceBasicProduct extends Serializable{ MarketplaceBasicProduct函数的...get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 {
我需要在这里添加实现IMarketplaceBasicProduct吗？
回答 1
Stack Overflow用户
发布于 2012-06-01 06:34:06
您将获得ClassCastException，因为您的类MarketplaceBasicProductList 不是 IMarketplaceProductList。
MarketplaceBasicProductList extends AbstractProductList implements IMarketplaceProductList 从您的结构来看，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才会实现IMarketplaceProductList
此外，我认为IMarketplaceProductList将在IProductList之上提供特性，因此IMarketplaceProductList的定义应该如下：
public interface IMarketplaceProductList extends IProductList {
}https://stackoverflow.com/questions/10845441
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