Web file server - Methods 125 In the first call to multiply()
Methods 125 In the first call to multiply() in the OverloadDemo program, a and b are passed in. Because a and b are both ints, the following version of multiply() in the Calculator class is invoked: public int multiply(int x, int y) When the two doubles d1 and d2 are passed in to multiply(), the corresponding overloaded version in Calculator is invoked: public double multiply(double x, double y) In the following statement, only a single int is passed in, so the version of multiply that takes in a single int is invoked: intAnswer = calc.multiply(b); Similarly, invoking multiply() with three int arguments causes the corresponding multiply() with three int parameters to be invoked. I want to make an observation about the following statement in the OverloadDemo program: doubleAnswer = calc.multiply(b, f); The arguments are of type int and float, in that order. There is no multiply() method in the Calculator class that has a parameter list with an int and a float. However, because a float can be promoted to a double, notice that the multiply() method that gets invoked is the following: public double multiply(int x, double y); This situation in which the float is passed in to a double arises all the time when invoking methods (not just when a method is overloaded). When an argument does not exactly match a parameter, but the argument can be promoted to match a parameter, then the promotion will occur automatically. Constructors A constructor is a special method in a class that is invoked when the object gets instantiated. The purpose of a constructor is to allow the fields of the object to be initialized when the object is instantiated.
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