This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma 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.