Java instanceof用法.写一个例子

Sure, here's an example:

public class Animal {
  public void eat() {
    System.out.println("This animal is eating.");
  }
}

public class Dog extends Animal {
  public void bark() {
    System.out.println("Woof woof!");
  }
}

public class InstanceOfExample {
  public static void main(String[] args) {
    Animal animal = new Dog();
    if (animal instanceof Dog) {
      Dog dog = (Dog) animal;
      dog.bark();
    } else {
      animal.eat();
    }
  }
}

In this example, we have an `Animal` class and a `Dog` class that extends `Animal`. We create a new instance of `Dog` and assign it to an `Animal` reference variable. We then use `instanceof` to check if the `Animal` object is also a `Dog`. If it is, we can safely cast it to a `Dog` and call `bark()`. If it's not a `Dog`, we can call the `eat()` method on the `Animal` object.