java 动物叫声调用问题

Question

public class Main {

public void Howl() {
    System.out.println("叽里咕噜");
}

public static void main(String[] args) {
    Cat cat = new Cat();
    cat.Howl();
    Dog dog = new Dog();
    dog.Howl();
    Duck duck= new Duck();
    duck.Howl();
    Chook chook= new Chook();
    chook.Howl();
}

}

class Cat extends Main {
public void Howl() {
System.out.println("cat:喵喵");
}
}

class Dog extends Main {
public void Howl() {
System.out.println("dog:汪汪");
}
}

class Duck extends Main{
public void Howl() {
System.out.println("duck:嘎嘎");
}
}

class Chook extends Main {
public void Howl() {
System.out.println("chook:咯咯");
}
}
朋友们，这个怎么给他加上一个代码，不是让他四个一起输出，而是我调用哪一个就输出哪一个叫声

Answer 1

你要输出哪个，就new那一个。现在不就是这样的吗？没搞懂你的要求