Communication between objects
When an object invokes another object, how is information passed? For instance, an object that requires the user to enter a country and calls a listing to print the attractions in that country.
A web panel is used to request data from the user. A variable is used in it as dynamic combo box, that is: a variable that loads all countries for the user to make his selection. We study the parm rule to declare the parameters that an object receives. We use “in” to indicate that a parameter is input. Only the case where the parameters declared in parm rule are variables is studied here.
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