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extends Thread Vs implements Runnable

 
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Both are implementing run() method. If i choose Runnable interface, supports multiple interface inheritance. Why do we need Thread class ?
 
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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.
 
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This may help: http://faq.javaranch.com/java/ExtendingThreadVsImplementingRunnable
 
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