importjava.util.ArrayList;importjava.util.List;// 泛型类publicclassInventory<T>{privateList<T>items;publicInventory(){items=newArrayList<>();}publicvoidaddItem(Titem){items.add(item);}publicvoiddisplayItems(){for(Titem:items){System.out.println(item);}}}// 电子产品类classElectronics{privateStri...