使用反射在方法中查找通用参数的类型

Question

How Can i Find Foo and generic class for read method using reflection?

 public void contactUsAvail(List<Foo> list) {
       // method block
    }

Answer 1

You can't, as the parameter type Foo is erased at compile time. Type parameters are compiler hints only in Java and are not retained for execution.

But you could give your method a hint by passing in Foo as a method parameter:

public void <F extends Foo>contactUsAvail(Class<F> type, List<F> list) {
    if(SubclassOfFoo.class.isAssignableFrom(type)) {
        //all elements in 'list' inherit from 'SubclassOfFoo'
    }
}