![]() ![]() Note that both parameters and returning values are declared as Object, because we don’t know with what we are going to be dealing. Public Object divide(Object n1, Object n2) throws ArithmeticException * ArithmeticException If the divisor is 0. Public Object multiply(Object n1, Object n2) ĭivisor.java package Public Object subtract(Object n1, Object n2) Let’s declare an interface for each of the arithmetic operations:Īdder.java package So, each operation would be a dependency. Commonly known as “String Calculator”.Īnd there are combinable among the operations. The simplest calculator possible, with add, subtract, multiply and divide operations.īut the problem is that we don’t know how we are going to perform those arithmetic operations yet. Imagine that we want to develop a calculator. Before starting mocking, let’s create a project. ![]()
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