Given： class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and： ClassA p0 = new ClassA（）； ClassB p1 = new ClassB（）； ClassC p2 = new ClassC（）； ClassA p3 = new ClassB（）； ClassA p4 = new ClassC（）； Which three are valid？（）

A . p0 = p1； B . p1 = p2； C . p2 = p4； D . p2 = （ClassC）p1； E . p1 = （ClassB）p3； F . p2 = （ClassC）p4；

时间：2022-09-20 11:47:06 所属题库：OCJP(310-065)题库

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