用java编写编写一个类Animal，描达动物的属性和行为，通过继承Animal类定 义Bird类、Fish 类，分别描述鸟类和鱼类的属性和行为，具体要求奶下： 〈1〕Animal类定义属性namex color、fooINumber，我述动物的名称、颜色、脚的 只数；定义成员方法showInfo0，用于输出动物的属性信息；定义成员方法move0，用于描述动物如何行走（输茁“可以通过飞、跑、游等方式移动身体”， （2）通过继承Animal定 XBid类 改写交类的move万法（输出 “通过飞来移动身 体”），增加一个方法nesto用子描述在哪里筑巢： 〈3）通过继承Animal定 义Fish类 改章交爽的move方法,《綸山 “通过游米移欢身 体”，，增加一个属性length，用于指还魚的身长口改写交类的showinfo0方法，除了输出neme、colorfoo(Vumber属性，还要緰出鱼的身长 （4）编写测试类，分别创建上达B个类的对象，并给对象的所有属性赋值，调用对象的所有方法。

以下是Java代码实现：

// Animal类
public class Animal {
    protected String name;
    protected String color;
    protected int footNumber;
    
    public Animal(String name, String color, int footNumber) {
        this.name = name;
        this.color = color;
        this.footNumber = footNumber;
    }
    
    public void showInfo() {
        System.out.println("Name: " + name);
        System.out.println("Color: " + color);
        System.out.println("Foot number: " + footNumber);
    }
    
    public void move() {
        System.out.println("Move by flying, running, swimming, etc.");
    }
}

// Bird类
public class Bird extends Animal {
    public Bird(String name, String color, int footNumber) {
        super(name, color, footNumber);
    }
    
    public void move() {
        System.out.println("Move by flying");
    }
    
    public void nest() {
        System.out.println("Build nest on the tree");
    }
}

// Fish类
public class Fish extends Animal {
    private int length;
    
    public Fish(String name, String color, int footNumber, int length) {
        super(name, color, footNumber);
        this.length = length;
    }
    
    public void showInfo() {
        super.showInfo();
        System.out.println("Length: " + length);
    }
    
    public void move() {
        System.out.println("Move by swimming");
    }
}

// 测试类
public class Test {
    public static void main(String[] args) {
        Animal animal = new Animal("Tiger", "Orange", 4);
        animal.showInfo();
        animal.move();
        
        Bird bird = new Bird("Sparrow", "Brown", 2);
        bird.showInfo();
        bird.move();
        bird.nest();
        
        Fish fish = new Fish("Salmon", "Pink", 0, 30);
        fish.showInfo();
        fish.move();
    }
}

输出结果如下：

Name: Tiger
Color: Orange
Foot number: 4
Move by flying, running, swimming, etc.
Name: Sparrow
Color: Brown
Foot number: 2
Move by flying
Build nest on the tree
Name: Salmon
Color: Pink
Foot number: 0
Length: 30
Move by swimming