java - 通过反射获取所有内部类

Question

我有以下问题。我有这个漂亮的类，现在我想获取所有扩展该类的类(内部类)并用它填充“classList”。 (当然是自动的)

public abstract class CompoundReference {

    private static List<Class<? extends CompoundReference>> classList
            = new ArrayList<Class<? extends CompoundReference>>();


    @CompoundKey(gsType = User.class, dbType = UserDetailsMappings.class)
    public static class CUser extends CompoundReference {
    }

    @CompoundKey(gsType = Catalog.class, dbType = CatalogDetailsMappings.class)
    public static class CCatalog extends CompoundReference {
    }

    @CompoundKey(gsType = Product.class, dbType = ProductDetailsMappings.class)
    public static class CProduct extends CompoundReference {
    }

    @CompoundKey(gsType = Category.class)
    public static class CCategory extends CompoundReference {
    }

    @CompoundKey(gsType = Poll.class, dbType = PollDetailsMappings.class)
    public static class CPoll extends CompoundReference {
    }
    // much mroe inner classes

一些手动解决方案只是维护这样一个静态 block ，这是我不想做的事情。

  static {
        classList.addAll(Arrays.asList(CUser.class, CCatalog.class,
                CProduct.class, CCategory.class,
                CPoll.class, CComment.class, CWebPage.class,
                CReview.class, CPost.class, CMessage.class, CStory.class,CPicture.class));

    }

Answer 1

classList.addAll(Arrays.asList(CompoundReference.class.getDeclaredClasses()));

我应该注意到，从泛型的角度来看，这是不安全的，因为 getDeclaredClasses 方法可以返回所有类型的类，而不仅仅是封闭类的子类，它只是一个 Class<?> 的数组。 ，因此您可能需要根据用例的需要进行迭代和确认/转换。