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//Notice how concise the code has become in the logic
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publicintcalculate(charop, inta, intb) {
Third example for "Rethinking interf...Third example for "Rethinking interfaces". Now making totally equivalent our "interface class" to implement our interface.
Transforming it to an abstract appro...Transforming it to an abstract approach instead of interface approach (having some part of the code already implemented).