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I have read up the concept of what you said. However, I want to know if 'a' can reference a J_SubClass or not. And why ? That's the key.

Why can my code be compiled ? And why can't J_SuperClass be cast to J_SubClass ?:confused:
2393
The following is my code:


class J_SuperClass {
}

class J_SubClass extends J_SuperClass {
}