技术问答java鐖剁被鎬庝箞寮曠敤鎸囧悜瀛愮被瀵硅薄 - 扬州沐宇科技

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ParentClass parent = new ChildClass();

public void acceptParentClass(ParentClass parent) {
// ...
}
ChildClass child = new ChildClass();
acceptParentClass(child);

ParentClass parent = new ChildClass();
ChildClass child = (ChildClass) parent;

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