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"); } }