造型转换的问题???
Employee[] staff = new Employee[3];
Manager boss = new Manager(...);
staff[0] = boss;
staff[1] = new Employee(...)
...
Manager aaa = (Manager)staff[0];
Manager aaa = (Manager)staff[1];
请问上面第一句 staff[0]本来就指向Manager对象 可不可以不要(Manager)???
第二句 为什么是错的???难道父类不能向子类转换吗???