我使用了一个反射库，它扫描所有子类的类路径:https://github.com/ronmamo/reflections

这是如何做到的:

Reflections reflections = new Reflections("my.project");
Set<Class<? extends SomeType>> subTypes = reflections.getSubTypesOf(SomeType.class);

将它们添加到父类构造函数(this. getclass (). getname())内部的静态映射(或创建一个默认映射)，但这将在运行时更新。如果可以选择延迟初始化，可以尝试这种方法。

还要注意的是，这当然只能找到当前类路径中存在的所有子类。想必这对于你目前所看到的是可以的，而且你也有可能考虑过这一点，但如果你在任何时候发布了一个非最终类(对于不同程度的“狂野”)，那么其他人已经编写了他们自己的子类，而你不知道这是完全可行的。

Thus if you happened to be wanting to see all subclasses because you want to make a change and are going to see how it affects subclasses' behaviour - then bear in mind the subclasses that you can't see. Ideally all of your non-private methods, and the class itself should be well-documented; make changes according to this documentation without changing the semantics of methods/non-private fields and your changes should be backwards-compatible, for any subclass that followed your definition of the superclass at least.

我需要将此作为一个测试用例，以查看是否向代码中添加了新的类。这就是我所做的

final static File rootFolder = new File(SuperClass.class.getProtectionDomain().getCodeSource().getLocation().getPath());
private static ArrayList<String> files = new ArrayList<String>();
listFilesForFolder(rootFolder); 

@Test(timeout = 1000)
public void testNumberOfSubclasses(){
    ArrayList<String> listSubclasses = new ArrayList<>(files);
    listSubclasses.removeIf(s -> !s.contains("Superclass.class"));
    for(String subclass : listSubclasses){
        System.out.println(subclass);
    }
    assertTrue("You did not create a new subclass!", listSubclasses.size() >1);     
}

public static void listFilesForFolder(final File folder) {
    for (final File fileEntry : folder.listFiles()) {
        if (fileEntry.isDirectory()) {
            listFilesForFolder(fileEntry);
        } else {
            files.add(fileEntry.getName().toString());
        }
    }
}

我使用了一个反射库，它扫描所有子类的类路径:https://github.com/ronmamo/reflections

这是如何做到的:

Reflections reflections = new Reflections("my.project");
Set<Class<? extends SomeType>> subTypes = reflections.getSubTypesOf(SomeType.class);

不要忘记，为类生成的Javadoc将包括一个已知子类列表(对于接口，包括已知实现类)。