关于java反射获取泛型

public class Test<T> {

    private final TypeToken<T> typeToken = new TypeToken<T>(getClass()) {};

    private final Type type = typeToken.getRawType();

    public void foo() {

        System.out.println(this.type);

    }

    public static void main(String[] args) {

        Test<Integer> test = new Test<Integer>() {};

        Test<Integer> test2 = new Test<Integer>();

        test.foo();// class java.lang.Integer

        test2.foo();//

    }

}

Test<String> test2 = new Test<String>();

private final TypeToken<T> typeToken = new TypeToken<T>(getClass()) {};

  private final TypeToken<T> typeToken = new TypeToken<T>(getClass()) {};

Constructs a new type token of T while resolving free type variables in the context of declaringClass.

Clients create an empty anonymous subclass. Doing so embeds the type parameter in the anonymous class's type hierarchy so we can reconstitute it at runtime despite erasure.