Java多态详解

package QianFeng02;
//多态
public class Polymorphic {
    public static void main(String[] args){
      //  HomeCh homeCh=new HomeCh("家鸡1");//一般实例化
        Chickens homeCh=new HomeCh("家鸡1");//Chickens是父类  HomeCh是子类(多态)
        homeCh.eat();
        Chickens pheasant=new Pheasant("野鸡2");
        pheasant.eat();
        //用父类的引用指向子类的对象
//        homeCh=pheasant;
//        homeCh.eat();
        System.out.println("------------------------");
        eat(homeCh);
        eat(pheasant);
        Chickens jan=new Jan("尖叫鸡4");//Chickens也可以替换为Jan
        eat(jan);
    }
    //抽象:::面向抽象编程
    public static void eat(Chickens c){//Chickens是父类可以传不同类的对象(而不是只传jan对象或者homeChdu对象)
        System.out.println("鸡翅3");
        c.eat();
    }
}
//鸡
// 不能被实例化
//抽象类的非抽象子类必须对父类抽象方法进行覆盖
abstract class Chickens{//父类一般定义为抽象类
    private String name;
    public Chickens(){}
    public Chickens(String name){
        this.name=name;
    }
    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return name;
    }
     public abstract void eat();//抽象方法必须定义为public或者abstract
}
//家鸡
class HomeCh extends Chickens{
    public HomeCh(String name){
        super(name);//调用父类带参数构造方法(因为父类带参构造)
    }
    @Override
    public void eat() {
        System.out.println(getName()+"吃大米");
    }
}
//野鸡
class  Pheasant extends Chickens{
    public Pheasant(String name){
        super(name);
    }
    @Override//重写抽象类父类的方法
    public void eat() {
        System.out.println(getName()+"吃虫子");
    }
}
//尖叫鸡
class Jan extends Chickens{
    public Jan(String name){
        super(name);
    }
    @Override//重写抽象类父类的方法
    public void eat() {
        System.out.println(getName()+"不吃");
    }
}