extends Thread Vs implements Runnable

[kri shan]

Both are implementing run() method. If i choose Runnable interface, supports multiple interface inheritance. Why do we need Thread class ?

[Sebastian Janisch]

If you implement Runnable you still have to pass your class to a Thread if you want to start it. Following the 'Favor Composition Over Inheritance' you most likely are always better off implementing Runnable than extending Thread.

[Ulf Dittmer]

This may help: http://faq.javaranch.com/java/ExtendingThreadVsImplementingRunnable