Java Novice Learning Notes---polymorphism

 Public classTestpolymorphism { Public Static voidMain (string[] args) {Animal a=NewCat ();        Testvoice (a); //Testvoice (New Cat ());    }     Public Static voidTestvoice (Animal a) {a.voice (); if(Ainstanceofcat)        {((cat) a). Catchmouse (); }    }}classAnimal {String name;  Public voidVoice () {System.out.println ("AAAAA"); }}classCatextendsanimal{ Public voidVoice () {System.out.println ("Nya"); }     Public voidCatchmouse () {System.out.println (Caught); }}classDogextendsanimal{ Public voidVoice () {System.out.println ("Wang"); }}

Nya Snatch

A cat can call it an animal, pass an animal parameter can pass a cat, judge this animal is what use instanceof.

After the cat called the animal can not call the Cat method, remember the strong turn it for the cat.

Java Novice Learning Notes---polymorphism