Why are there 2 ways to create threads?

Hi,
To create threads, there are two methods
1) Inherit the THREAD super-class
2) Implement the interface RUNNABLE.
The reason for providing two methods is that, the user can only one level of "implementation inheritance". That is the reason, which comes immediately to mind. But is there another reason(s)? If yes, than what is the reason??
Any help would be welcome
Thanks in advance

I think that the main reason is that java does not support multiple inheritance. If you need to have a thread functionality and facilities from another class except Thread simultaneously you can do it implementing Runnable and extending other class in your class.

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