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Optional Methods in interface

 
Greenhorn
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Can we implement optional methods in user defined interface.If so then is it that we declare some methods in interface and dont define it in the class that implement it and it is not abstract .....(Is this So..)


Please clear the confusion............(Anybody having clear view)
 
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Moving it to SCJP
 
Ranch Hand
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If you have a concrete class that implements an interface then you must define all methods from that interface.
 
Greenhorn
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All methods declared in interfaces should be defined by Classes implementing interfaces.

If you want the Class not to implement all/some of the methods in interface, then the Class should be declared abstract. No other way.

Any class extending the abstract class will define those methods.
 
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