Java 抽象类详解：从理论到实践

1. 什么是抽象类？

举一个 Animal 类、Cat 类和 Dog 类的例子：

class Animal {
    public void eat() {
        System.out.println("吃饭~");
    }
}
class Dog extends Animal {
    public void eat() {
        System.out.println("吃骨头~");
    }
    public void bark() {
        System.out.println("汪汪~");
    }
}
class Cat extends Animal {
    // 构造器
    public void eat() {
        System.out.println("吃鱼~");
    }
    public void mimi() {
        System.out.println("喵喵~~");
    }
}
public class Main {
    public static void main(String[] args) {
        Dog dog = new Dog();
        dog.eat();
        Cat    ();
        cat.eat();
    }
}