This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
This is because r1 is an implementer of the Runnable Interface. Thread class also is an implementer of Runnable. But there is no relation between r1(anonymous sub-class referenced by r1) and the Thread class.