JAVA 用polymorphism一道題目的問題

Question

一问题是这样的:先建立一个Animal的 class 是 abstract Animal有 move() 这个方法接着有 狗、人、鸟三个class 分别的移动是 "四只脚 "&amp;"两只脚" &amp; "翅膀"都继承自Animal继承Animal的类别,必须改写其move...

PHPz · Answer

public abstract class Animal {
    public void move() {
        System.out.println();
    }
}

public class Bird extends Animal {
    public void move() {
        System.out.println( " 翅膀 " );
    }
}
public class Dog extends Animal {
    public void move() {
        System.out.println( "四只脚" );
    }
}

public class Human extends Animal {
    public void move() {
        System.out.println( "两只脚" );
    }
}

public class Main {

    public static void main(String[] args) {
        Animal[] animals = new Animal[3];

        animals[0] = new Bird();

        animals[1] = new Dog();

        animals[2] = new Human();

        for (Animal animal : animals)
            animal.move();
    }
}

Run screenshot

ringa_lee · Answer

So, what’s the problem? The code you wrote is wrong too

for(int i=0;i


I didn’t see you declare the makeattribute anywhere at all! What exactly are you trying to achieve?

大家讲道理 · Answer

Change the move method of animal to abstract. I think your question is saying that subclasses must be rewritten.

迷茫 · Answer

abstract class Animal{
    public abstract void move();
}
class Dog extends Animal{
    public void move(){
            System.out.println("四只脚");
    }
}
class Bird extends Animal {
    public void move(){
        System.out.println(" 翅膀 ");
    }
}
class Human extends Animal {
    public void move(){
        System.out.println("两只脚");
    }
}
public class Main{
    public static void main(String[] args){
      Animal[] animals = new Animal[3];
      animals[0] = new Bird();
      animals[1] = new Human();
      animals[2] = new Dog();
      for(int i=0;i