参考手册

参考手册

实例 Java 多态性

​x
 
class Animal {
  public void animalSound() {
    System.out.println("The animal makes a sound");
  }
}
​
class Pig extends Animal {
  public void animalSound() {
    System.out.println("The pig says: wee wee");
  }
}
​
class Dog extends Animal {
  public void animalSound() {
    System.out.println("The dog says: bow wow");
  }
}
​
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();
  }
}
​
                    

输出结果

The animal makes a sound
The pig says: wee wee
The dog says: bow wow