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balaji Jayararmanbalaji Jayararman 

How many interfaces can be implemented in the implementing apex class?

NagendraNagendra (Salesforce Developers) 
Hi Balaji,

One class can implement any number of interfaces, allowing a single class to have multiple behaviors.

You can't do that with abstract or virtual classes, because each child can only inherit from one parent. 

Hope this helps.

Kindly mark this as solved if the reply was helpful.

Thanks,
Nagendra