创建父类:动物。拥有姓名、月份、物种三个属性，有吃东西、输出年龄的方法。 创建子类狗，继承父类，有体重和尾巴两个属性，有定义尾巴形状、输出物种、获取体重的方法。 创建子类企鹅，继承父类，有体重这个属性，有跑、输出物种、获取体重的方法。 创建测试类。定义企鹅、输出方法，定义狗，输出方法。 用Java写

以下是Java代码实现：

// 父类 Animal
class Animal {
    protected String name;
    protected int month;
    protected String species;

    public Animal(String name, int month, String species) {
        this.name = name;
        this.month = month;
        this.species = species;
    }

    public void eat() {
        System.out.println(name + " is eating.");
    }

    public void outputAge() {
        System.out.println(name + " is " + month + " months old.");
    }
}

// 子类 Dog
class Dog extends Animal {
    private double weight;
    private String tailShape;

    public Dog(String name, int month, String species, double weight, String tailShape) {
        super(name, month, species);
        this.weight = weight;
        this.tailShape = tailShape;
    }

    public void defineTailShape(String shape) {
        tailShape = shape;
        System.out.println(name + "'s tail shape is " + tailShape + ".");
    }

    public void outputSpecies() {
        System.out.println(name + " is a " + species + ".");
    }

    public double getWeight() {
        return weight;
    }
}

// 子类 Penguin
class Penguin extends Animal {
    private double weight;

    public Penguin(String name, int month, String species, double weight) {
        super(name, month, species);
        this.weight = weight;
    }

    public void run() {
        System.out.println(name + " is running.");
    }

    public void outputSpecies() {
        System.out.println(name + " is a " + species + ".");
    }

    public double getWeight() {
        return weight;
    }
}

// 测试类
public class Test {
    public static void main(String[] args) {
        // 创建企鹅对象
        Penguin penguin = new Penguin("Peng", 6, "Emperor penguin", 20.5);
        // 输出物种和体重
        penguin.outputSpecies();
        System.out.println(penguin.getWeight());

        // 创建狗对象
        Dog dog = new Dog("Max", 12, "Golden retriever", 25.8, "curled");
        // 输出物种和体重
        dog.outputSpecies();
        System.out.println(dog.getWeight());
    }
}