public class TestDog {

 

   public static void main(String[] args) {

        Dog d = new Dog();

        d.setAge(10);

        d.setName("花花");

        d.setHostName("小明");

        System.out.println("name:" + d.getName() + " age:" + d.getAge()

                + "hostName:" + d.getHostName());

       

        System.out.println(d.toString());

    }

}

// 生物

class Creator {

    private int age;

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public Creator() {

        super();

        System.out.println("this is Creator's constructor");

    }

}

// 动物类

class Animal extends Creator {

    private String name;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Animal() {

        super();

        System.out.println("this is Animal's constructor");

    }

}

// 狗

class Dog extends Animal {

    private String hostName;

    public String getHostName() {

        return hostName;

    }

    public void setHostName(String hostName) {

        this.hostName = hostName;

    }

    public Dog() {

        super();

        System.out.println("this is Dog's constructor");

    }

}