java-polymorphism to realize electronic pet system
Effect realization:
code realization:
1. Master human:
public class Master {
//领养
public Pet adopt(String name){
if ("狗狗".equals(name)){
return new Dog();
}else if (name.equals("企鹅")){
return new Penguin();
}
return null;
}
//喂食
public void feed(Pet pet, String food){
pet.eat(food);
}
//玩耍
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();
}
}
//捐献
public Pet donate(String name){
if("狗狗".equals(name)){
return new Dog();
}else if(name.equals("企鹅")){
return new Penguin();
}
return null;
}
}
2. Dog category:
public class Dog extends Pet {
public void catchDisk(){
System.out.println("狗狗接飞盘！");
}
public Dog(int health) {
super(health);
}
public Dog() {
}
@Override
public void eat(String food) {
System.out.println("狗狗吃"+food+"，吃饱后健康值+3");
setHealth(getHealth()+3);
}
}
3. Penguins:
public class Penguin extends Pet{
public void swimInSouth(){
System.out.println("企鹅在南极游泳！");
}
public Penguin(int health) {
super(health);
}
public Penguin() {
}
@Override
public void eat(String food) {
System.out.println("企鹅宝宝吃"+food+",吃完后，健康值加5");
setHealth(getHealth()+5);
}
}
4. Pets, 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("已经吃饱了，再吃就撑破了");
}
}
public Pet() {
}
public Pet(int health) {
this.health = health;
}
public void eat(String food){
System.out.println("宠物吃"+food);
}
}
5. Test category:
public class Test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
Master master = new Master();
//领养
System.out.print("请输入您要领养的宠物：");
String dname = sc.next();
Pet p = master.adopt(dname);
//主人给狗狗喂食，玩耍
System.out.print("请输入您要喂得食物：");
String dfood = sc.next();
master.feed(p,dfood);
System.out.println(p.getHealth());
master.play(p);
//主人给企鹅喂食，玩耍
System.out.print("请输入您要玩的宠物：");
String pname = sc.next();
p = master.adopt(pname);
System.out.print("请输入您要喂的食物：");
String pfood = sc.next();
master.feed(p,pfood);
System.out.println(p.getHealth());
master.play(p);
//捐赠出去
System.out.print("请输入您要捐赠的宠物：");
String jname = sc.next();
Pet pet = master.donate(jname);
System.out.println();
System.out.println("您捐献的是："+pet.getClass().getName());
}
}
Supplement: I let the user input in the console for the test class. If you don't want to input, you can replace the test class Test with the following code:
public class TestPet {
public static void main(String[] args) {
Master m = new Master();
//领养
Pet p = m.adopt("狗狗");
//主人给狗狗喂食，玩耍
m.feed(p,"大骨头");
System.out.println(p.getHealth());
m.play(p);
//主人给企鹅喂食，玩耍
p = m.adopt("企鹅");
m.feed(p,"小鱼");
System.out.println(p.getHealth());
m.play(p);
//捐献出去
Pet pet = m.donate("狗狗");
System.out.println("您捐献的是："+pet.getClass().getName());
}
}