Java：是否可以比较一个类 <?> 具有通用类型参数的对象？

Question

Suppose i have a list of classes:

List<Class<?>> classes;

If i now take one of these classes, lets say... the second, and would want to know if it represents the String class, i would do the following:

classes.get(1).equals(String.class)

but how can i know if it represents a generic type... say T?

class Foo<T> {

    void someMethod(){

        System.out.println(classes.get(1).equals(T)); //error: T cannot be resolved to a variable
    }
}

i tried

T.class
(Class<T>)T

But nothing works. I would really like to know if this is possible, and if it is, how to achieve it.
Thanks for your attention! =)

Answer 1

This is not possible in Java, due to type erasure ( http://en.wikipedia.org/wiki/Type_erasure ) - T does not actually exist at runtime, it only exists as information for the compiler. The standard way of fixing this is to pass in a Class<T> from wherever T is reified and use that class object.

Answer 2

这是不可能的，但是您可以为类提供一些包装器，这些包装器将使用一种返回类型的方法来实现简单接口，然后将该接口作为通用类型传递。