接口练习题输出语句

package Ling;

/**
 * author:Melirn
 * date:2021.4.22
 * E-mail:2227287556@qq.com
 */

public interface Animal {
    String animal();
    String attribute();
    String age();
}

package Ling;
/**
 * author:Melirn
 * date:2021.4.22
 * E-mail:2227287556@qq.com
 */
public class Bird implements Animal{
    public String animal(){
        String animal = "鸟";
        return animal;
    }
    public String attribute(){
        String attribute = "红色";
        return attribute;
    }
    public String age(){
        String age = "5岁";
        return age;
    }
}

package Ling;
/**
 * author:Melirn
 * date:2021.4.22
 * E-mail:2227287556@qq.com
 */
public class Fish implements Animal{
    public String animal(){
        String animal = "鱼";
        return animal;
    }
    public String attribute(){
        String attribute = "5斤重";
        return attribute;
    }
    public String age(){
        String age = "2岁";
        return age;
    }
}

package Ling;
/**
 * author:Melirn
 * date:2021.4.22
 * E-mail:2227287556@qq.com
 */
public class AnimalTest {
    public static void main(String[] args) {
        Animal bird = new Bird();
        Animal fish = new Fish();
        System.out.println("我是一只"+bird.attribute()+"的"+bird.animal());
        System.out.println("我今年"+bird.age()+"了");
        System.out.println("我是一条"+fish.attribute()+"的"+fish.animal());
        System.out.println("我今年"+fish.age()+"了");
    }

}