Class object type parameterization in Java

Question

Suppose the following object structure: ``` class Super {} class SubA extends Super {} class SubB extends Super {} ``` I want to be able to have a variable that will hold the class object for either of my subclasses. I feel like this should do it: ``` Class classObj; ``` Then, I want to be able to something like this: ``` classObj = SubA.class; ``` or: ``` classObj = SubB.class; ``` This doesn't work though. I get the following error: ``` Type mismatch: cannot convert from Class to Class ``` Any ideas why? What do I need to fix?

Accepted Answer

You need a bounded wildcard:

```
Class<? extends Super> classObj;
```

See the lesson on wildcards from the Java tutorials.

Class object type parameterization in Java

Solution

Problem