对Class使用泛型语法的一些问题

关于think in java上的

An interesting thing happens when you use the generic syntax for Class objects: newlnstance( ) will return the exact type of the object, rather than just a basic Object as you saw in ToyTest.java. This is somewhat limited

class Toy{
    private String name;
    Toy(){}
    Toy(int i){}
}
class FancyToy extends Toy{
    FancyToy(){
        super(1);
    }
}
public class GenericToyTest{
    public static void main(String...args) throws Exception{
        Class<FancyToy> ftClass = FancyToy.class;
        FancyToy fancyToy = ftClass.newInstance();
        Class<? super FancyToy> up = ftClass.getSuperclass();
              // Object.class;
        //!Error
        //!Class<Toy> up2 = ftClass.getSuperclass();
        //!Toy t = up.newInstance();
        System.out.println(up.getName());
        Object obj = up.newInstance();
    }
}

输出结果为 com.company.Toy

1. Class<? super FancyToy> up;与Class<Toy> up不是一样的(以后再研究区别)
2. Toy t = up.newInstance();//Error
   up接受的为：FancyToy的超类
   up可以接受Toy.class和Object.class
   up.newInstance();自然可能返回Object的实例化或Toy的实例化，是很模糊的。

以后应该会有更深刻的理解
（未完待续）