implementing multiple interfaces

[Lucas Smith]

Consider that:

interface A{ int a();}
interface B{ void a();}

class C implements A, B{
	//implementation
	
}    

[Ankit Garg]

Is this a question?? You can't implement both interface A and B in one class...

[Lucas Smith]

OK, but a class can implement multpile interfaces. It's a particular example. Stay tuned!

[Prithvi Sehgal]

Well,

This program won't compile. Because you cannot implement both interfaces in class C.
Compiler will be ambigious about method a(). Try to change the argument list in either A
or B, then will allow you to implement both the interfaces, as one method will be correctly
overloaded.

Best Regards,

[Henry Wong]

Lucas Smith wrote:OK, but a class can implement multpile interfaces. It's a particular example. Stay tuned!

Yes, Java supports implementing multiple interfaces --- but that doesn't mean that you can use the feature to get around overloading rules. You are not allowed to have to methods with the same signature and different return types in a class.

Henry

[Lucas Smith]

I see. I can notice some bugs in Java.

interface A{ int a();}  
 interface B{ int a();}  
   
 class C implements A, B{  
     public int a(){ return 0;}
      
}        

It is not perfect. The intention behind method a() from those interfaces can be different.