How to delete a feature class from a GDB using ArcObjects for Java?

I've seen this solution which may works in ArcObjects for VB/.Net:

How to overwrite a shapefile or feature class using arcobjects

When I try to convert it into Java, I get a ClassCastException on the IDataset cast.

Here is my code:

IWorkspace workspace = ...
IWorkspace2 workspace2 = (IWorkspace2)workspace;
if(workspace2.isNameExists(esriDatasetType.esriDTFeatureClass, featureClassName)) {
    IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;
     // ClassCastException here
    IDataset featureClassDataset = (IDataset)featureWorkspace.openFeatureClass(featureClassName);
    if(featureClassDataset.canDelete()) {
        featureClassDataset.delete();
    } else {
        // alert: the feature class exists but couldn't be deleted
    }
}
IFeatureClass featureClass = featureDataset.createFeatureClass(...);

Does anyone know how we can't use the IDataset interface for a feature class as in VB?

How to delete a feature class in Java else?