An abstract class is a class declared with an abstract keyword which is a collection of abstract and non-abstract methods while a concrete class is a class that allows creating an instance or an object using the new keyword. Thus, this is the main difference between abstract class and concrete class.
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Abstract classes may contain abstract methods, but concrete classes can’t . Abstract classes usually have partial or no implementation. On the other hand, concrete classes always have full implementation of its behavior. Unlike concrete classes, abstract classes cannot be instantiated.14 Tem 2014
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