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The program introduces an abstract class 'Calculator' with an abstract method 'add'. This method is then overridden in a subclass 'Adder'. The 'Adder' class extends the 'Calculator' class and provides the implementation for the 'add' method. The 'add' method takes two integers as parameters and returns their sum.
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The solution uses the concept of abstract classes and method overriding in Java. An abstract class is a class that cannot be instantiated and is meant to be subclassed. It can contain abstract methods which are declared but not implemented. In this case, 'Calculator' is an abstract class with an abstract method 'add'. A subclass 'Adder' then extends 'Calculator' and provides the implementation for the 'add' method. Method overriding is a feature that allows a subclass to provide a specific implementation of a method that is already provided by its parent class.
abstract class Calculator {
abstract int add(int a, int b);
}
class Adder extends Calculator {
@Override
int add(int a, int b) {
return a + b;
}
}
public class TheAdderClass {
}
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