如何动态地指定Java泛型类 [英] How to specific a Java Generic class dynamicly
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问题描述
如果我指定了一个返回泛型类的方法,那我该怎么做,而不是动态地指定泛型的类型? 例如
If I specific a method which return a generic class,how can I do than I can specific the type of generic class dynamicly ? for example
try {
Class c =Class.forName(keytype);
Class d= Class.forName(valuetype);
KafkaConsumer<c,d> consumerconsumer = new KafkaConsumer<c,d>(PropertiesUtil.getPropsObj(configPath));
return consumer ;
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
但是上面的代码不正确.我该怎么做才能实现目标?
But the code above is not OK. How can I do than I can achieve that?
推荐答案
您可以让您的键和值类分别实现一个已知的接口. 然后,您可以分配或投射它.
You can have your key and value class each implement a known interface. Then you can assign or cast it.
KafkaConsumer<IKeyType,IValueType> consumerconsumer = new KafkaConsumer<>(PropertiesUtil.getPropsObj(configPath));
或
KafkaConsumer<IKeyType,IValueType> consumerconsumer1 = (KafkaConsumer<IKeyType,IValueType>) new KafkaConsumer(PropertiesUtil.getPropsObj(configPath));
在此处阅读有关在泛型上加界限的信息. https://docs.oracle.com/javase/tutorial/java/generics/wildcards.html
Read here about putting bounds on your generics. https://docs.oracle.com/javase/tutorial/java/generics/wildcards.html
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