Do you have any specific questions?

i am trying to make a program that takes an object oriented approach to calculating the miles per gallon that your car gets. this is early in the process an i am aware that alot of stuff is missing. i am just trying to get it to work enough that i can figure it out. i can only go by examples of oop design because my resources are limited, so if something doesnt make sense, sorry. anyway, here is my code:

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/**
 * The purpose of this program is to demonstrate the use of a constructor
 * that takes parameters.  Notice that there is no problem with two constructors
 * with the same name as long as their parameter lists are different.  This is
 * referred to as overloading a constructor,
 * 
 * ©FLVS 2007
 * @author B. Jordan 
 * @version 05/28/07
 */
 
public class CarV5
{
 
 
 
    CarV5()
    {
    }
 
    public int calcDistance(int distance, int endMiles, int startMiles)
    {
        distance = endMiles - startMiles;
        return distance;
    }
 
    public double calcMPG(int mpg, int distance, int gallons)
    {
        mpg = distance/ gallons;
        return mpg;
 
    }
 
    //main method
    public static void main(String[] args)
    {
        int startMiles1 = 55;
        int endMiles1 = 250;
        int gallons1 = 15;
 
        int distance1, mpg1;
 
        distance1 = calcDistance(distance1,endMiles1,startMiles1);
        mpg1 = calcMPG(mpg1 ,distance1);
 
        System.out.println("                     Gas Mileage Calculations");
        System.out.println("Type of Car   Start Miles   End Miles   Distance   Gallons   Miles/Gallons");
        System.out.println("==========================================================================");
        System.out.printf("Saturn %4.2f    %4.2f    %4.2f    %4.2f    %4.2f    %4.2f" + startMiles1 + endMiles1 + distance1 +  gallons1 + mpg1);
    }
}

/** * The purpose of this program is to demonstrate the use of a constructor * that takes parameters. Notice that there is no problem with two constructors * with the same name as long as their parameter lists are different. This is * referred to as overloading a constructor, * * ©FLVS 2007 * @author B. Jordan * @version 05/28/07 */ public class CarV5 { CarV5() { } public int calcDistance(int distance, int endMiles, int startMiles) { distance = endMiles - startMiles; return distance; } public double calcMPG(int mpg, int distance, int gallons) { mpg = distance/ gallons; return mpg; } //main method public static void main(String[] args) { int startMiles1 = 55; int endMiles1 = 250; int gallons1 = 15; int distance1, mpg1; distance1 = calcDistance(distance1,endMiles1,startMiles1); mpg1 = calcMPG(mpg1 ,distance1); System.out.println(" Gas Mileage Calculations"); System.out.println("Type of Car Start Miles End Miles Distance Gallons Miles/Gallons"); System.out.println("=========================================================================="); System.out.printf("Saturn %4.2f %4.2f %4.2f %4.2f %4.2f %4.2f" + startMiles1 + endMiles1 + distance1 + gallons1 + mpg1); } }

but also to help me understand exactly how this works as i havent been able to find any good insructional information on this particular topic.