| Classes | | Structs |
| Reference type | | Value type |
| Used with dynamic instantiation | | Used with static instantiation |
| Ancestors of class Object | | Ancestors of class Object |
| Can be extended by inheritance | | Cannot be extended by inheritance |
| Can implement one or more interfaces | | Can implement one or more interfaces |
| Can initialize fields with initializers | | Cannot initialize fields with initializers |
| Can have a parameterless constructor | | Cannot have a parameterless constructor |
