What does the Type parameter for Thread and Runnable signify?

Question

Look at the following code from the ThreadFactory interface

 public Thread<T> newThread(Runnable<T> runnable);

What does s the type parameter convey here ? I mean Collection makes sense since T is specifying the type of objects that can go into the Collection but what does Runnable or Thread mean ?

Answer 1

In ThreadFactory.newThread(Runnable) there is no generic type, nor is Runnable or Thread a generic interface/class. The original must have been in error.

Answer 2

Thread class you are creating,it has to be the subclass of some other class, it can’t extend from the Thread class. This is because Java does not allow a class to inherit from more than one class. That's why Runnable interface to implement threads.

For better understanding,just take a look of these two links this1 and this2

Answer 3

It does not look like Runnable this was intended with the Runnable interface. Maybe you are getting confused with Callable. Here the generic type will be the type returned.