泛型 - 迭代ArrayList时的ClassCastException

import java.util.ArrayList;
import java.util.List;

public class GenericExample {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("World");

        for (String str : list) {
            System.out.println(str);
        }
    }
}

import java.util.ArrayList;
import java.util.List;

public class NonGenericExample {
    public static void main(String[] args) {
        List list = new ArrayList();
        list.add("Hello");
        list.add("World");

        for (String str : list) {
            System.out.println(str);
        }
    }
}