How to use java Polymorphism to realize Electronic Pet system

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The effect is achieved:

Code implementation:

1. Lord Human beings:

Public class Master {/ / adopt public Pet adopt (String name) {if ("dog" .equals (name)) {return new Dog ();} else if (name.equals ("penguin")) {return new Penguin ();} return null;} / / feed public void feed (Pet pet, String food) {pet.eat (food) / / play public void play (Pet pet) {if (pet instanceof Dog) {Dog d = (Dog) pet; d.catchDisk ();} else if (pet instanceof Penguin) {Penguin p = (Penguin) pet; p.swimInSouth () } / / donate public Pet donate (String name) {if ("dog" .equals (name)) {return new Dog ();} else if (name.equals ("penguin")) {return new Penguin ();} return null;}}

2. Dogs:

Public class Dog extends Pet {public void catchDisk () {System.out.println ("Dogs catch Frisbee!") ;} public Dog (int health) {super (health);} public Dog () {} @ Override public void eat (String food) {System.out.println ("dog eat" + food+ ", health value + 3"); setHealth (getHealth () + 3);}}

3. Penguins:

Public class Penguin extends Pet {public void swimInSouth () {System.out.println ("Penguins swim in Antarctica!") ;} public Penguin (int health) {super (health);} public Penguin () {} @ Override public void eat (String food) {System.out.println ("baby penguins eat" + food+ ", after eating, the health value adds 5"); setHealth (getHealth () + 5);}}

4. Pet category, Pet:

Public class Pet {private int health; public int getHealth () {return health;} public void setHealth (int health) {this.health= health; if (this.health > 100) {this.health=100; System.out.println. }} public Pet () {} public Pet (int health) {this.health = health;} public void eat (String food) {System.out.println ("pet eat" + food);}}

5. Test class:

Public class Test {public static void main (String [] args) {Scanner sc = new Scanner (System.in); Master master = new Master (); / / adopt System.out.print ("Please enter the pet you want to adopt:"); String dname = sc.next (); Pet p = master.adopt (dname) / / the owner feeds the dog and plays with System.out.print ("Please enter the food you want to feed:"); String dfood = sc.next (); master.feed (pdfood); System.out.println (p.getHealth ()); master.play (p) / / the owner feeds the penguin and plays with System.out.print ("Please enter the pet you want to play with:"); String pname = sc.next (); p = master.adopt (pname); System.out.print ("Please enter the food you want to feed:"); String pfood = sc.next (); master.feed (pforce pfood) System.out.println (p.getHealth ()); master.play (p); / / donated System.out.print ("Please enter the pet you want to donate:"); String jname = sc.next (); Pet pet = master.donate (jname); System.out.println (); System.out.println ("you donated:" + pet.getClass (). GetName ()) }}

Supplement: here I ask the user to enter the test class in the console. If you don't want to enter it, you can replace the test class Test with the following code:

Public class TestPet {public static void main (String [] args) {Master m = new Master (); / adopt Pet p = m.adopt ("dog"); / / the owner feeds the dog and plays with m.feed (p, "big bones"); System.out.println (p.getHealth ()); m.play (p) / / owners feed penguins and play p = m.adopt ("penguins"); m.feed (p, "little fish"); System.out.println (p.getHealth ()); m.play (p); / / donate Pet pet = m.donate ("dog"); System.out.println ("you donated:" + pet.getClass (). GetName ()) }} these are all the contents of the article "how to use java Polymorphism to implement Electronic Pet system". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.