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 ftClass=FancyToy.class;
FancyToy fancy=ftClass.newInstance();
Class 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.