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Thread: Confused about invoking methods?

  1. #1
    Junior Member ShamelessTeenie's Avatar
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    Default Confused about invoking methods?

    Hi, sorry for the extremely basic question, but I'm confused about something. I'm studying for my next computer science exam, and looking over past tests. One of the questions gives us three different methods and asks us to write statements to invoke them, which sounds really easy, and I thought that I had done it correctly. However, my professor gave us the correct output, and apparently, when you invoke a method and run the program, Java is supposed to output "methodWhatever has been invoked.", which my program isn't doing.

    I'm very confused. I thought that to invoke a method, all you had to do was pass it actual arguments that correspond to the method's parameters, but I'm doing that, and I'm still not getting any output. Maybe I'm missing something?

    These are the methods that we're supposed to invoke:
        public int fancyOpA (int x, String y){
           return 0;
        }
        public double fancyOpB (int x, double y){
            return 0;
        }
        public static double fancyOpC (int x, int y){
           return 0;
        }

    And here are the statements that I have to invoke them:

         int invokeA = fancyOpA(6, "bluh");
         double invokeB = fancyOpB(6, f);
         double invokeC = fancyOpC(6,7);


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Confused about invoking methods?

    The posted methods do nothing with the args passed to them and all return a value of 0.

    Java is supposed to output "methodWhatever has been invoked.", which my program isn't doing.
    Do you have a "special" version of java that does that? The version of java in the jre/JDK does not output any messages when a method is invoked.
    If you don't understand my answer, don't ignore it, ask a question.

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    Junior Member ShamelessTeenie's Avatar
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    Default Re: Confused about invoking methods?

    I know the methods don't do anything with the args. I didn't write those--they were just the methods that were given on the test question, so I don't think they're supposed to really serve any practical purpose.

    I don't have any special version of java, just the version in the JDK, so that's weird. I didn't think that it was supposed to output any messages when I invoked a method, but the test solution that he gave us (he didn't give us the correct codes, just the output messages that you'd get from the correct codes) said that when we invoked the methods, we should get a message telling us so.

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    Super Moderator Norm's Avatar
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    Default Re: Confused about invoking methods?

    said that when we invoked the methods, we should get a message telling us so.
    There must be something missing. What you've posted won't output anything.
    If you don't understand my answer, don't ignore it, ask a question.

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    ShamelessTeenie (April 9th, 2013)

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    Junior Member ShamelessTeenie's Avatar
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    Default Re: Confused about invoking methods?

    In that case, do you have any idea how I would code it to output the message? I'm sorry, to ask, but I'm lost. It says on the question that the statements to invoke the methods should only be one line of code each, so I don't know how I would do that, and I'm pretty sure we haven't covered anything like it in class.

    The question is very confusing, because it simply gives us the three methods, then tells us to write one-line statements invoking them, which I believe I did correctly. The test question itself didn't say anything about outputting anything-- that part was only on the solution sheet.

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    Super Moderator Norm's Avatar
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    Default Re: Confused about invoking methods?

    For the methods to print out a message when they are called, you would have to add a call to the println() method to the methods being called.
    If you don't understand my answer, don't ignore it, ask a question.

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