W3School TIY Editor

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class Main {
  public static void main(String[] args) {
    Animal myAnimal = new Animal();
    Animal myPig = new Pig();
    Animal myDog = new Dog();
        
    myAnimal.animalSound();
    myPig.animalSound();
    myDog.animalSound();
  }
}
class Animal {
  public void animalSound() {
    System.out.println("动物会发出声音");
  }
}
​
class Pig extends Animal {
  public void animalSound() {
    System.out.println("猪的叫声：哼哼");
  }
}
​
class Dog extends Animal {
  public void animalSound() {
    System.out.println("狗的叫声：汪汪");
  }
}
​