2020-08-02通过反射向Integer数组中添加字符串

public class Demo {
    public static void main(String[] args) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        ArrayList<Integer> arrayList = new ArrayList<>();
        arrayList.add(15);
        Class<? extends ArrayList> aClass = arrayList.getClass();
        Method add = aClass.getMethod("add", Object.class);
        add.invoke(arrayList,"hello");
        add.invoke(arrayList,"world");
        System.out.println(arrayList);
    }
}