[英]How to set generic type at runtime in java
I saw some questions like this but different from my case.I want to set generated class at build time as generic type at runtime. 我看到了类似这样的问题,但与我的情况不同:我想在构建时将生成的类设置为运行时的泛型类型。 here is code. 这是代码。
//employee class is generated at build time
void function(Class<?> employee)
{
// I want to set class as generic type like this
List<employee> emps= new ArrayList<employee>(employee);
}
how to do this? 这个怎么做?
You can't. 你不能
Generics are all mapped to java.lang.Object
on compilation by a process called type erasure . 泛型全部在编译时通过称为类型擦除的过程映射到java.lang.Object
。
You can only build things that are checked at compile time: consider using Class<? extends ...>
您只能构建在编译时检查的内容:考虑使用Class<? extends ...>
Class<? extends ...>
notation. Class<? extends ...>
表示法。
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