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Thread: Void Methods Question

  1. #1
    Junior Member Old Valyria's Avatar
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    Default Void Methods Question

    Okay so beginner programmer here and I've been self-teaching myself Java in preparation for my into class in the Spring.

    I am having trouble getting this program to run. As you can see, I am trying to use the threeLine method to create space between "First Line" and "Second Line" in the main method.

    public class method {
    public static void threeLine() {
    newLine();
    newLine();
    newLine();
    System.out.println("");
    }

    public static void main (String[] args) {
    System.out.println ("First Line."); threeLine();
    System.out.println ("Second Line.");

    }

    }

    Anyway, I am at adding new methods, and here's the code that I have that is not running (I am using a book and the book has the EXACT code but mine isn't running for some reason. I am getting error code "newLine method not defined for the class method"

    Thanks in advance


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    Default Re: Void Methods Question

    Welcome to the forum! Please read this topic to learn how to post code correctly along with other useful info for newcomers.

    What book are you using?

    Style point: In Java, class names begin with capital letters.

    The error message is clear, but I'll add a few words: The threeLine() method calls another method, newLine(). The method newLine() is not recognized by the compiler, so it doesn't know what to do with it. I suspect the newLine() method was covered elsewhere in that book you're reading, or it's part of a custom library that the book has either shown you how to build or download/copy from somewhere. Do a little more looking and see if you can' find some mention of it.

  3. The Following User Says Thank You to GregBrannon For This Useful Post:

    Old Valyria (December 25th, 2013)

  4. #3
    Junior Member Old Valyria's Avatar
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    Default Re: Void Methods Question

    @Greg

    You're spot on. I forgot to declare a new method threeLine(). I've been using "How to Think like a Computer Scientist - Java Programming" by Allen B. Downey

    Once I declared threeLine(), I was able to add newLine() underneath to print what I wanted (which, as you probably guessed, was just space between "First Line" and "Second Line")

    Here's the correct code:

    public class method {
    public static void newLine() {
    System.out.println ("");
    }
    public static void threeLine() {
    newLine();
    newLine();
    newLine();
    }

    public static void main (String[]args) {
    System.out.println ("First Line.");
    threeLine();
    System.out.println ("Second Line.");

    }

    }

    And I apologize I still don't know how to use the code function to put the code in, er, code. Thanks for your help!

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Void Methods Question

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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