Type types = superclass. ParameterizedType superclass = (ParameterizedType) clazz.getGenericSuperclass() Maybe there are some magic with "Field", I cannot get it working for a local variable (or parameter). interfaces now contains all common interfacesOf course you can get multiple results, so you would have to take a pick. So, all we need to do is to make the following import into our code: import. The JDK ships with a group of classes that are bundled in the package specifically for this purpose. Set set = getInterfaces(o.getClass()) // assumption: no element is null To use Java reflection, we don't need to include any special jars, any special configuration or Maven dependencies. Set interfaces = getInterfaces(first.getClass()) // assumption: no element is null Do this for all elements, each time using Collection.retainAll. Can you find all classes in a package using reflection At runtime, find all classes in a Java application that extend a base class How to get names of. You need to collect all interfaces a class implements using Class.getInterfaces() (don't forget the super classes!). otherwise it's the common super class of X.getSuperclass() and Y.getSuperclass()įor interfaces it's also not that hard. if Y is a direct or indirect super class of X then it's Y
if X is a direct or indirect super class of Y then it's X The common super class for any two classes X and Y is easy: You loop through all the elements and find out a common super class (worst case this will be ) or a number of common interfaces (0 or more). Annotations are defined via the interface annotation before the class name. In Java 1.4 all you can do is make a guess. The Java programming language allows you to define your custom annotations. again, please let me know if this should be posted as a new topic.am posting here for some inquisitive minds who may be looking out for this solution in java 1.4 i wish to find out their type (of B,C,etc.) (similar to OwnerType here) at runtime.ĭo we have any way to make that possible in java 1.4?.to add to this, i can't use instanceOf test as the component in which this utility goes has no other knowledge than the Object being passed to it. Now the question, i've an object of type A that has a List.the List contains objects of type B, C.etc. Public static void main(String args) throws Exception whose criteria has to be created. But only generics-related info is only available for the class in general - not for specific instances of the class. That info is also accessible via reflection. The class file contains info about the generic types of its member variables - that info is necessary if/when you try to compile another class using classes in a jar file, for example.
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