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Thread: Need help to format input.

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    Default Need help to format input.

    When i input a number in my append i need to have 3 - in it. for example when i have this number 12345678 I need it to write to file 123-45-678. I would think i need to use the format thing but need a nudge in the right direction.

     ja.append(add0+"+");


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    Default Re: Need help to format input.

    Append of what? A string? What is ja? I don't understand the rules you describe. I recommend breaking what you need into these rules, its easier for us and a computer to understand.

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    Default Re: Need help to format input.

    String ja = textArea;
    add0 = input number variable;

    I need the input number to be 12345678; (input from user 8 numbers)
    but when its output (write to .dat) it gets written as 123-45-678:
    How do i accoplish this in code.

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    Default Re: Need help to format input.

    Quote Originally Posted by miller4103 View Post
    String ja = textArea;
    add0 = input number variable;

    I need the input number to be 12345678; (input from user 8 numbers)
    but when its output (write to .dat) it gets written as 123-45-678:
    How do i accoplish this in code.
    What did you try? Presuming you want a dash after the third and fifth number - did you try a loop? Have you tried breaking the input string into substrings?

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    Default Re: Need help to format input.

    I have never heard about substrings. What are they. Also i will try a loop right now. I dont know why i didnt think of a loop although i dont know how to get it to do that.
    would i use an if-for or while loop? and how do i get the loop to count the numbers?

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    Super Moderator copeg's Avatar
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    Default Re: Need help to format input.

    I have never heard about substrings. What are they.
    The API is worth studying for all classes that you use. See String (Java Platform SE 6) and the substring method.

    Also i will try a loop right now. I dont know why i didnt think of a loop although i dont know how to get it to do that.
    would i use an if-for or while loop? and how do i get the loop to count the numbers?
    Write it out slowly on paper - loop through the string one character at a time and consider at which positions you need to insert

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    Default Re: Need help to format input.

    Thank you very much for the nudge.
     ja.append(add0.substring(0,3)+"-"+add0.substring(3,5)+"-"+add0.substring(5)+"\n");

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    Default Re: Need help to format input.

    You're welcome

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