java 多态

package text2;

public class Animal {
private String name;
private int age;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}
public void cry(){
    System.out.println("不知道怎么叫");
    
}
}

package text2;

public class Cat extends Animal{
    
public void cry(){
    System.out.println("喵喵叫");
}
}

package text2;

public class Dog extends Animal{
public void cry(){
    System.out.println("汪汪叫");
}
}

package text2;

public class Tset {
public static void main(String[] args){
    Cat cat=new Cat();
    cat.cry();
    Dog dog=new Dog();
    dog.cry();
    Animal an=new Cat();
    an.cry();
    an=new Dog();
    an.cry();
}
}

package text2;

public class Animal {
private String name;
private int age;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}
public void cry(){
    System.out.println("不知道怎么叫");
    
}
public void eat(){
    
}
}

package text2;

public class Cat extends Animal{
    
public void cry(){
    System.out.println("喵喵叫");
}
public void eat(){
    System.out.println("猫喜欢吃鱼");
}
}

package text2;

public class Dog extends Animal{
public void cry(){
    System.out.println("汪汪叫");
}
public void eat(){
    System.out.println("狗喜欢吃骨头");
}
}

package text2;

public class Food {
String name;
public void showname(){
    
}

}

package text2;

public class Bone extends Food{
public void showname(){
System.out.println("我是骨头");    
}

}

package text2;

public class Master {
//给动物喂食物
    public void feed(Animal an,Food f)//灵活
        {
        an.eat();
        f.showname();
    }
    
}

package text2;

public class Tset {
public static void main(String[] args){
    Master master=new Master();
    master.feed(new Dog(), new Bone());
    
}
}