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Thread: How do I create an object(function)?

  1. #1
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    Default How do I create an object(function)?

    I am new to java, but have taken one VB class.
    I am working on a common exercise:
    Bags of coffee sell for $5.50.
    User orders a number of bags.
    number of bags * cost per bag.
    Bags are shipped in 3 sizes of boxes: large, medium, and small.
    Cost: Large= $ 1.80, Medium cost $1.00, and Small cost $0.60.
    The goal is to minimize cost- pack the bags most efficiently and cheaply.
    I have worked up to the equation: number of bags * cost per bag.
    I don't know how to create a function in java to do the other computing.


  2. #2
    Administrator copeg's Avatar
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    Default Re: How do I create an object(function)?

    If you don't know this, I suggest you start at the beginning:
    Java Tutorials
    In particular:
    Defining Methods

  3. #3
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    Default Re: How do I create an object(function)?

    I guess I was not clear:

    Class object;
    object = new Class;

    What I meant was I wasn't clear how to word the function that computed
    the amount of boxes needed.

    Thank you for posting the links. They do explain what I need to do.
    Last edited by amarettoCoffee; January 18th, 2011 at 06:05 PM. Reason: Thank moderator and clarify.

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    Super Moderator helloworld922's Avatar
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    Default Re: How do I create an object(function)?

    I suggest looking at how to define classes.

    public class Box
    {
        // your class definition goes here
     
        // this is a field
        private int fitsHowManyCoffees;
     
        // this is a constructor
        public Box(int fitsHowManyCoffees)
        {
            this.fitsHowManyCoffees = fitsHowManyCoffees;
        }
     
        // this is a method
        public int getFitsHowMany()
        {
            return fitsHowManyCoffees;
        }
    }

    public class User
    {
        public static void main(String[] args)
        {
            // this creates a new box which can hold 3 coffees
            Box holds3 = new Box(3);
            System.out.println("the box holds " + holds3.getFitsHowMany() + " coffees.");
        }
    }
    Last edited by helloworld922; January 18th, 2011 at 06:58 PM.

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