LinkedDigitCounter will look like this A DigitCounter on the other hand need

Linkeddigitcounter will look like this a digitcounter

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/* Decrement this Counter. */ void decrement(); /* Reset this Counter. */ void reset(); } Implementing the classes: A common structural pattern is to define an abstract class that implements an interface, defines data common to all interface implementations, and provides some default method implementations. Concrete classes can then extend the abstract class: We will define an abstract class AbstractCounter that inherits the abstract methods of the interface Counter and defines an int component variable to contain the value of the counter. The abstract class also defines a constructor that initializes the value to 0. The
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