Question

Consider a simple case where I ask a user to select a fruit among 10 different fruits. Say the fruits are, apples, oranges, mangoes,… etc., If the user selects apples, I call apples(), if he selects mangoes, I call mangoes() and so on…

To select which function is to be called, I DON’T want to use a switch or if-else statements. How do I select which function is to be called during run-time?

NOTE : The programming language I am using is Java

Answer 1

Use java Refection api to call function at runtime.

        Class noparams[] = {};
        Class cls = Class.forName("com.test.Fruit");
        Object obj = cls.newInstance();

        //call the printIt method
        Method method = cls.getDeclaredMethod("apples", noparams);
        method.invoke(obj, null);