java程序设计:设计bird类,fish类,都继承自Animal,实现其方法printInfo(),输出信息.

public class Test {

public static void main(String[] args) {

Bird b = new Bird("红色", 4);

Fish f = new Fish("5", 2);

b.printInfo();

f.printInfo();

}

}

public abstract class Animal {

String color;

String weight;

int age;

public abstract void printInfo();

}

public class Bird extends Animal {

Bird(String color, int age) {

super.color = color;

super.age = age;

}

@Override

public void printInfo() {

System.out.println("我是一只" + color + "的鸟！");

System.out.println("今年" + age + "岁了！");

}

}

public class Fish extends Animal {

Fish(String weight, int age) {

super.weight = weight;

super.age = age;

}

@Override

public void printInfo() {

System.out.println("我是一条" + weight + "斤重的鱼！");

System.out.println("今年" + age + "岁了！");

}

}