Khi nào thì lớp cha cast được thành lớp con?
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Ví dụ mình có 2 lớp thế này:
class A { // do something } class B extends A { // do something }Thì khi và chỉ khi mình khai báo là
A a = new B();thì mình mới cast được làB b = (B)a;thôi em ạ