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Why Java has a feature to create a thread by extending a thread

 
Greenhorn
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Why Java has a feature to create a thread by extending a Thread when it already has a way by implementing the Runnable interface?
 
Rancher
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Welcome to JavaRanch.

You wouldn't extend the Thread class merely to start a thread, you would extend it if you wanted to add additional behavior to what the Thread class already does: https://coderanch.com/how-to/java/ExtendingThreadVsImplementingRunnable
 
Don't get me started about those stupid light bulbs.
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