Assume the availability of an existing class, ICalculator , that models an integer arithmetic calculator and contains:   an instance variable currentValue that stores the current int value of the calculator and can be accessed and modified by any subclass methods add , sub , mul , and div Each method in ICalculator receives an int argument and applies its operation to currentValue and returns the new value of currentValue . So, if currentValue has the value 8 and sub(6) is invoked then currentValue ends up with the value 2 , and 2 is returned. Write a public subclass, ICalculator2 , based on ICalculator . The class ICalculator2 has one additional method, negate , that receives no arguments. The effect of negate is to reverse the sign of currentValue . For example, if currentValue is zero, there is no change, if it is -22 then it becomes 22 , if it is 100 it becomes -100 . Furthermore negate returns the new value of currentValue Assume that variable currentValue is accessible in the subclass

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