Java面向对象程序设计多态性示例

Dog dog=new Dog("欧欧","雪纳瑞");
dog.eat();
Pet pet=new Dog("欧欧","雪纳瑞");//子类到父类的转换
pet.eat();
pet.catchingFlyDisc();//编译错误,父类的引用无法调用子类的特殊方法

public class Master
{
  private String name = "";
  private int money = 0;
  public Master(String name, int money) {
    this.name = name;
    this.money = money;
  }
  public void feed(Pet pet) {
    pet.eat();
  }
  public void feed(Dog dog) {
    dog.eat();
  }
  public void feed(Penguin pen) {
    pen.eat();
  }
}
public class Test()
{
  public static void main(String[] args) {
    Master master = new Master("王先生", 100);
    Pet pet = new Dog("欧欧", "雪纳瑞");
    master.feed(pet);
  }
}

public class Master{
  private String name = "";
  private int money = 0;
  public Pet getPet(int id)
  {
  Pet pet=null;
  if(id==1)
  {
  pet=new Dog("欧欧","雪纳瑞")
  }
  else if(id==2)
  {
  pet=new Penguin("娜娜","帝企鹅");
  }
  return pet;
  }
}