相关疑难解决方法(0)

public class Animal {
    public void eat() {}
}

public class Dog extends Animal {
    public void eat() {}

    public void main(String[] args) {
        Animal animal = new Animal();
        Dog dog = (Dog) animal;
    }
}

赋值Dog dog = (Dog) animal;不会生成编译错误,但在运行时会生成一个ClassCastException.为什么编译器无法检测到此错误？