What does the Type parameter for Thread and Runnable signify?
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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<T> makes sense since T is specifying the type of objects that can go into the Collection but what does  Runnable<T> or Thread<T> mean ? 