1 changed files with 80 additions and 0 deletions
@ -0,0 +1,80 @@ |
|||
/** |
|||
* 练习1:动物叫声系统 |
|||
* 需求:使用抽象类和接口改进动物系统 |
|||
* 1. 创建抽象类Animal,包含抽象方法makeSound() |
|||
* 2. 创建Dog和Cat继承Animal |
|||
* 3. 创建接口Swimmable,包含方法swim() |
|||
* 4. 让Dog实现Swimmable,Cat不实现 |
|||
* 5. 在main方法中测试多态调用 |
|||
*/ |
|||
|
|||
// 游泳接口:定义会游泳的动物的行为规范
|
|||
interface Swimmable { |
|||
/** |
|||
* 游泳方法 |
|||
*/ |
|||
void swim(); |
|||
} |
|||
|
|||
// 抽象动物类:所有动物的父类,定义通用行为
|
|||
abstract class Animal { |
|||
/** |
|||
* 抽象方法:发出声音,由具体子类实现 |
|||
*/ |
|||
public abstract void makeSound(); |
|||
} |
|||
|
|||
// 狗类:继承Animal,实现Swimmable接口(会游泳)
|
|||
class Dog extends Animal implements Swimmable { |
|||
/** |
|||
* 实现抽象方法:狗的叫声 |
|||
*/ |
|||
@Override |
|||
public void makeSound() { |
|||
System.out.println("汪汪汪!"); |
|||
} |
|||
|
|||
/** |
|||
* 实现Swimmable接口:狗的游泳行为 |
|||
*/ |
|||
@Override |
|||
public void swim() { |
|||
System.out.println("小狗在水里游泳~"); |
|||
} |
|||
} |
|||
|
|||
// 猫类:仅继承Animal,不实现Swimmable(不会游泳)
|
|||
class Cat extends Animal { |
|||
/** |
|||
* 实现抽象方法:猫的叫声 |
|||
*/ |
|||
@Override |
|||
public void makeSound() { |
|||
System.out.println("喵喵喵~"); |
|||
} |
|||
} |
|||
|
|||
// 主类:包含main方法,用于测试多态调用
|
|||
public class AnimalSystem { |
|||
public static void main(String[] args) { |
|||
// 1. 多态创建动物数组:父类引用指向子类对象
|
|||
Animal[] animals = {new Dog(), new Cat()}; |
|||
|
|||
// 2. 多态调用makeSound()方法,体现面向对象多态特性
|
|||
System.out.println("===== 动物叫声测试 ====="); |
|||
for (Animal animal : animals) { |
|||
animal.makeSound(); |
|||
} |
|||
|
|||
// 3. 测试游泳能力:只有实现Swimmable接口的Dog可以调用swim()
|
|||
System.out.println("\n===== 游泳能力测试 ====="); |
|||
for (Animal animal : animals) { |
|||
// 类型判断:安全转型,避免类型转换异常
|
|||
if (animal instanceof Swimmable) { |
|||
((Swimmable) animal).swim(); |
|||
} else { |
|||
System.out.println(animal.getClass().getSimpleName() + "不会游泳"); |
|||
} |
|||
} |
|||
} |
|||
} |
|||
Loading…
Reference in new issue