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Hi, This is from ExamLab. Please advice why I am getting this error at Line 9.
 
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Saibabaa Pragada wrote:Hi, This is from ExamLab. Please advice why I am getting this error at Line 9.



rb is Runnable(Supertype) type reference-variable and is referring to an instance of its anonymous subclass(Subtype), so using that reference it is not possible to invoke a method that does not exist in Runnable<interface>.

Note: When super class reference-variable is referring subclass instance then through that reference only those methods can be invoked that exists in both superclass and the subclass.
 
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Can you please check the API for Runnable to see if it has start() method defined for it? You always use a Thread instance to start the thread.
 
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You have to pass the Runnable type object to a Thread object, after that you have to invoke start() on the Thread object
 
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This is the correct way to invoke start();

Regards!


 
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