xxx can not access a member of class xxxx with modifiers ""

今天做java反射测试，出现此错误，下面是代码：

public class GetClass {

public interface HasBatteries{}

public interface Waterproof{}

public interface Shoots{}

/**

* 默认构造器必须有

* You must define the required default constructor for up.newInstance( ); the

compiler can’t create it because a non-default constructor already exists.

* @author Administrator

*

*/

public static class Toy{

public Toy(){}

public Toy(int i){}

}

}

public class FancyToy extends Toy implements HasBatteries, Waterproof, Shoots {

public FancyToy(){

super(1);

}

}

public class GenericToyTest {

public static void main(String[] args) throws Exception {

Class<FancyToy> ftClass=FancyToy.class;

FancyToy fancy=ftClass.newInstance();

Class<? super FancyToy> up=ftClass.getSuperclass();

Object obj= up.newInstance();

System.out.println(obj);

}

}

Exception in thread "main" java.lang.IllegalAccessException: Class th.GenericToyTest can not access a member of class th.FancyToy with modifiers ""

网上各种查询，说Class前面要必须是public，但是我的就是public;最后各种调试，发现问题出在构造函数这块，构造函数是默认的修饰符，包可见的，

必须改成public，有继承关系的子类父类的构造函数也要修改成public,改完运行ok.