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abstract keyword

 
Greenhorn
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A question the definition says - Used to declare a calss that cannot be instantiated/a method that must be impleemnted by a non abstract class.

Can someone please give an example to clarify this doubt?
thanks
 
Ranch Hand
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Take a look at how you cannot instantiate Component class... Abstract,
but you use it as a base for its sub-classes , Button etc which can be instantiated because they are concrete.
 
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