Java 发布地图声明<;字符串,类<;?扩展可序列化>&燃气轮机;
Java通过Java 发布地图声明<;字符串,类<;?扩展可序列化>&燃气轮机;,java,generics,hashmap,extends,serializable,Java,Generics,Hashmap,Extends,Serializable,Java通过 map2由类型K(在本例中为String)和V(Class您需要使用以下内容)限定 Map<String, ? extends GenericClass<? extends Serializable>> map2 = new HashMap<String, GenericClass<String>>(); mapnewhashmap中缺少一个>,对不起,我粘贴不正确,编辑可能重复的内容无法回答问题。 Map<S
map2
由类型K
(在本例中为String
)和V
(Class您需要使用以下内容)限定
Map<String, ? extends GenericClass<? extends Serializable>> map2 =
new HashMap<String, GenericClass<String>>();
mapnewhashmap中缺少一个>,对不起,我粘贴不正确,编辑可能重复的内容无法回答问题。
Map<String,GenericClass<? extends Serializable>> map2 = new HashMap<String, GenericClass<String>>();
public class GenericClass<T>
{
.
.
.
}
Type mismatch: cannot convert from HashMap<String,GenericClass<String>> to Map<String,GenericClass<? extends Serializable>>
Map<String,? extends Serializable> map1 = new HashMap<String,String>();
Map<String,GenericClass<? extends Serializable>> map2 = new HashMap<String, GenericClass<String>>();
Map<String, ? extends GenericClass<? extends Serializable>> map2 =
new HashMap<String, GenericClass<String>>();