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Thread: Trying to learn Java programming

  1. #1
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    Default Trying to learn Java programming

    I am trying to learn Java programming and I am trying to figure out how to call a class to write a larger program. I have included the small part of the program that I am trying to get to work but I keep getting a compiler error. Can anyone help me figure this out. I have also copied in the error that I am getting from TextPad when I try to compile this.

    ************************************************** ************************************************** **************************

    import javax.swing.JOptionPane;
    import java.text.NumberFormat;

    public class Chapter7Prog1RandyHaupert
    {

    public static void main (String [] args)

    {

    int quarters, dimes, nickels, pennies;
    double totalamount = 0;

    String input = JOptionPane.showInputDialog (null, "How many quaters do you have. " );
    quarters = Integer.parseInt (input);

    quarters = Coins.getQuarters (dimes);

    }

    }

    import java.text.DecimalFormat;

    public class Coins

    {
    public final DecimalFormat MONEY = new DecimalFormat( "$#,##0.00" );

    public Coins( int newQuarters, int newDimes, int newNickels, int newPennies )
    {

    setQuarters( newQuarters );
    setDimes( newDimes );
    setNickels( newNickels );
    setPennies( newPennies );
    }
    /** getQuarters method
    * @return number of dimes
    */
    public int getQuarters( )
    {
    if (Quarters == 0)
    {
    System.out.print ("You have no quarters.\n" );
    }
    else
    {
    return Quarters;
    }
    }

    }

    ************************************************** ************************************************** *************************

    C:\Users\Randy\Documents\Trine University\CS113 Java Programming\Chapter7Prog1RandyHaupert.java:26: error: class, interface, or enum expected
    import java.text.DecimalFormat;
    ^
    1 error

    Tool completed with exit code 1

    ************************************************** ************************************************** *************************


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Trying to learn Java programming

    You need to put all of the import statements together at the beginning of the file.

    Each public class must go in its own file with a filename the same as the classname.

  3. #3
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    Default Re: Trying to learn Java programming

    Norm,

    Thank you for your reply. I understand about moving the import statement but I don't understand about the class and it's file name.

    Randy

  4. #4
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    Default Re: Trying to learn Java programming

    I don't understand about the class and it's file name.
    What part? The names must be the same for a public class.
    do you know what a class name is?
    do you know what a filename is?

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    Default Re: Trying to learn Java programming

    I thought that the class name was the name for program like "Chapter7Prog1RandyHaupert" for the main program and "Coins" for what I would call my function. I guess I do not understand what the filename is though.

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Trying to learn Java programming

    I do not understand what the filename is
    I'm sure you know what a filename is.

    I'm taking about the name the OS gives to a file. What you see when you look at the contents of a directory.

  7. #7
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    Default Re: Trying to learn Java programming

    Ok, I think the light bulb just went on dimly, so does the main program look in the .java directory when I tell it to call the (function)(class) "Coins"

  8. #8
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    Default Re: Trying to learn Java programming

    Your concepts seem confused.
    The code in a method (all methods are in a class) can call another method that can be in another class or in the same class.
    That has nothing to do with a .java directory.

    .java looks more like a file's extension than the name of a directory.

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