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Thread: calculation in GUI interface

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    Question calculation in GUI interface

    Hello there,

    I'm trying to create a GUI interface in Netbeans that calculates a phone bill.

    I created a GUI interface that input:
    - Account Name.
    - Account Number.
    - Number of Minutes the phone was used. (with a textarea so the user input the minutes)
    - 2 JRadioButtoms so the user can chose the regular or premium service.
    - Amount Due (+10% taxes) (also with a textarea)
    - Clear/Enter/Result/Done Buttoms

    And I need to output:
    - Account Name.
    - Account Number.
    - Number of Minutes.
    - Taxes
    - Total Amount Due.

    I have a couple of math formulas I have to add them to output the above however I'm new to java so I don't know which code to use.

    The math formulas are:
    -Regular charges = 20 + ( No. Minutes - 50 ) * 0.20
    -Premium charges = 50 + ( No. Minutes - 75 ) * 0.50
    -Taxes = ( Regular charges + Premium charges ) * 0.10
    -Amount Due = Regular charges + Premium charges + Taxes


  2. #2
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    Default Re: calculation in GUI interface

    What have you tried?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: calculation in GUI interface

    I tried different methods but they don't work. i thing there was something wrong with the code. also, i named each variable a name and i wrote -- System.out.print((a+(min. + c) * b)); -- something like that.
    but i don't know which code to use i'm kinda slow with java loooool

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    Default Re: calculation in GUI interface

    It's hard to make suggests about your code without seeing it.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: calculation in GUI interface

    private void ENTERActionPerformed(java.awt.event.ActionEvent evt) {
    //- Regular charges = 20+ ( R min – 50)*0.20
    //- Premium charges = 50+ ( P min – 75) * 0.50
    //- Sales tax=(R charges + P charges)*0.10
    //- Amount due= Regular charges + Premium charges + Sales tax
    double a = 20;
    double b = 50;
    double c = 0.20;
    double d = 50;
    double e = 75;
    double f = 0.50;
    double rmin = Double.parseDouble(NMTEXT.getText());
    double pmin = Double.parseDouble(NMTEXT.getText());
    System.out.print((a+(rmin-50)*c));

    }

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    Default Re: calculation in GUI interface

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.

    Ok, what are your problems?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: calculation in GUI interface

    I think you should first of all understand the problem you are trying to solve before solving it.You said you wanted to develope a programm to calculate phone bill ,from your code i cant connect the problem with the code you have there.Try to be more explicit.

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