🌸思维导图🌸

🌸一.多态概念🌸

🌸二.多态实现条件🌸

package Test1;
class Animal {
    String name;
    int age;

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

    public void eat() { //父类的方法
        System.out.println(age + "岁的" + name + "正在吃-----");
    }
}
class Dog extends Animal {
    public Dog(String name, int age) {
        super(name,age);
    }
    @Override           //这表明父类方法被重写了
    public void eat() {  //子类重写父类方法
        System.out.println(age + "岁的" + name + "正在吃狗粮");
    }
}
class Cat extends Animal {
    public Cat(String name, int age) {
        super(name, age);
    }

    @Override
    public void eat() {     //子类重写父类方法
        System.out.println(age + "岁的" + name + "正在吃猫粮");
    }
}
public class Test1 {
    public static void eat(Animal animal) { //Animal animal就是父类的引用
        animal.eat();
    }
    public static void main(String[] args) {

        Dog dog = new Dog("狗狗", 3);
        Cat cat = new Cat("猫猫", 4);
        eat(dog); ///通过父类的引用调用对应的eat方法
        eat(cat);
    }
}

🌸三.重写和重载🌸

🌸四.转型🌸

🍎1.向上转型🍎

package Test1;
class Animal {
    String name;
    int age;

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

    public void eat() { //父类的方法
        System.out.println("父类方法");
    }
}
class Dog extends Animal {
    public Dog(String name, int age) {
        super(name,age);
    }
    @Override           //这表明父类方法被重写了
    public void eat() {  //子类重写父类方法
        System.out.println(age + "岁的" + name + "正在吃狗粮");
    }
    public void bark() {
        System.out.println("汪汪叫");
    }
}

public class Test1 {
    public static void eat(Animal animal) { //Animal animal就是父类的引用
        animal.eat();
    }
    public static void main(String[] args) {
        Animal animal =new Dog("狗狗",3);
        eat(animal); 
        animal.eat(); //两者运行结果相同
    }
}