public class Person {
     private String name;
     private Pet pet;
     
     public Person() {}
     public Person(String name,Pet pet){
         this.name=name;
         this.pet=pet;     
     }
     public void petHappy(){
         pet.scream();
     }
     public String getName() {
         
 
return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     
}

public abstract class Pet {
    private String pname;
    
    public Pet(){}
    public Pet(String pname){
        this.pname = pname;
    }
    public abstract void scream();/*{
        System.out.println("寵物的叫聲");
    }
 
*/
    
    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }
}

public class Tiger extends Pet{
    public String fur;

    public Tiger(String fur,String name) {
        super(name);
        this.fur = fur;
    }

    
 
public Tiger() {
        super();
        
    }
    

    @Override
    public void scream() {
        System.out.println("這是一只老虎的叫聲");
    }

    public String getFur() {
        return fur;
    }

    public void setFur(String fur) {
        this.fur = fur;
    }
    
    
}

public class Main {
    public static void main(String[] args){
        Tiger t1 =new Tiger();
        Rabbit t2 = new Rabbit();
        
        Person p1 = new Person("小明",t1);
        Person p2 = new Person("小紅",t2); 
        p1.petHappy();
        p2.petHappy();
    }
}

寵物類例題