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Cannot make a static reference to the non-static method add()

 
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Hi

I have made a simple class as shown below





When i tried this , i am getting this compile time error :

Cannot make a static reference to the non-static method add()

Please tell me whats the mistake i am making here .
 
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Just what it says. The add method is not static and you are calling it as if it were.
 
Ravi Kiran Va
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Thanks .
forgot to create the Object for that interface .
 
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First you need to create an implementation and then create an instance of it
 
Ravi Kiran Va
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Thanks , i already created that , but did not post as the question might look too lengthy.
 
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