父类不能转换成子类

Exception in thread "main" java.lang.ClassCastException: Person cannot be cast to Boy
    at Test.main(Test.java:5)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

public class Test {

    public static void main(String[] args) {
        Person person = new Person();
        Boy boy = (Boy) person;
        boy.eat();
    }

}

class Person {
    public void eat() {
        System.out.println("The people were eating");
    }
}

class Boy extends Person {
    public void eat() {
        System.out.println("The boy were eating");
    }
}