0.必须有抽象父类，且被继承 1.必须包含 >=2 个包2.必须创建 >=5 个类(其中包含抽象父类)3.类中属性皆为私有属性，需定义读写方法 4.子类需要重写个别父类方法

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// 抽象父类 Animal
public abstract class Animal {
    private String name;
    
    public Animal(String name) {
        this.name = name;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public abstract void makeSound();
}

// 包 animal
package animal;

public class Cat extends Animal {
    private int age;
    
    public Cat(String name, int age) {
        super(name);
        this.age = age;
    }
    
    public int getAge() {
        return age;
    }
    
    public void setAge(int age) {
        this.age = age;
    }
    
    @Override
    public void makeSound() {
        System.out.println("Meow");
    }
}

public class Dog extends Animal {
    private String breed;
    
    public Dog(String name, String breed) {
        super(name);
        this.breed = breed;
    }
    
    public String getBreed() {
        return breed;
    }
    
    public void setBreed(String breed) {
        this.breed = breed;
    }
    
    @Override
    public void makeSound() {
        System.out.println("Woof");
    }
}

public class Elephant extends Animal {
    private int weight;
    
    public Elephant(String name, int weight) {
        super(name);
        this.weight = weight;
    }
    
    public int getWeight() {
        return weight;
    }
    
    public void setWeight(int weight) {
        this.weight = weight;
    }
    
    @Override
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