package studyjava; import javax.xml.namespace.QName; /*1. 创建Fish类，它继承Animal类 2. 重写Animal的walk方法以表明鱼不能走且没有腿。 3. 实现Pet接口 4. 无参构造方法 5. 提供一个private 的name属性 */ public class Fish extends Animal implements Pet { private String name; public Fish() { super(0); } public void walk() { System.out.println("Fish has " + legs + "legs can walk"); } public void eat() { System.out.println("fish eat grass"); } public String getName() { return this.name; } public void setName(String name) { this.name = name; } public void play() { System.out.println(name + "is playing"); } public static void main(String[] args) { Fish fish = new Fish(); System.out.println(fish.legs); fish.setName("kilo"); fish.play(); fish.eat(); System.out.println(fish.getName()); fish.walk(); } }