Instances of polymorphic in Java

1  Public classCF {2 3     /**4 * Actually this involves the priority problem of method invocation,5 * Priority levels are from high to Low: This.show (O), Super.show (O), This.show (Super) O, Super.show (Super) O. 6      */7      Public Static voidMain (string[] args) {8 9A A1 =NewA ();TenA A2 =NewB (); Oneb b =NewB (); Ac C =NewC (); -D d =NewD (); -System.out.println (A1.show (b));//①a and A theSystem.out.println (A1.show (c));//②a and A -System.out.println (A1.show (d));//③a and D -System.out.println (A2.show (b));//④b and A -System.out.println (A2.show (c));//⑤b and A +System.out.println (A2.show (d));//⑥a and D -System.out.println (B.show (b));//⑦b and B +System.out.println (B.show (c));//⑧b and B ASystem.out.println (B.show (d));//A and D at     } - } -  - classA { -      PublicString Show (D obj) { -         return("A and D"); in     } -  to      PublicString Show (A obj) { +         return("A and a"); -     } the } *  $ classBextendsA {Panax Notoginseng      PublicString Show (B obj) { -         return("B and B"); the     } +  A      PublicString Show (A obj) { the         return("B and A"); +     } - } $  $ classCextendsB { - } -  the classDextendsB { -}

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Instances of polymorphic in Java