My First Java Program

[Mike?]

I just finished my first Java program for my CS162 class. It might look simple to a day to day programmer but this was one hell of a project for me.

/*****************************************************************
Car simulation which allows the user to drive, add gas, change and 
check the oil, honk the horn and check the odometer all under real
life restrictions.
@author Mike P.
@version 2009.01.28
*****************************************************************/
public class Car {

    /** total miles which is read by the odometer **/
    private double mileage;
    
    /** miles until the next oil change **/
    private double milesTillNextOilChange;
    
    /** gallons of gas which is in the car **/
    private double gallonsOfGas;
    
    /** miles per gallon **/
    private double mpg;
    
    /** full tank of gas in the car **/
    private double fullTank;;
    
    /** miles before running out of gas **/
    private double milesBeforeRunningOutOfGas;
    
   /*****************************************************************
    * Sets the miles per gallon, a full tank, mileage, gas in the car,
    * miles till the next oil change, and miles before the car runs
    * out of gas.
    * @return none
    * *****************************************************************/
    public Car () {
        mpg = 22.7;
        fullTank = 12.5;
        mileage = 0;
        gallonsOfGas = 0;
        milesTillNextOilChange = 3000;
        milesBeforeRunningOutOfGas = 0;
    }
    
    /*****************************************************************
     * Sets a new miles per gallon
     * @return none
     * *****************************************************************/
     public Car (double mpg) {
        this.mpg = mpg;
        fullTank = 12.5;
        mileage = 0;
        gallonsOfGas = 0;
        milesTillNextOilChange = 3000;
        milesBeforeRunningOutOfGas = 0;
    }
    
    /*****************************************************************
     * Tests if the car is already out of gas, the driver runs out of
     * gas before completeing the trip but the odometer is updated
     * correctly, or if the driver completes the trip without running
     * out of gas.
     * @param miles must be in "int" or "double" form
     * @return none
     * *****************************************************************/
    public void drive (double miles) {
        mileage = mileage + miles;
        milesTillNextOilChange = milesTillNextOilChange - miles;
        milesBeforeRunningOutOfGas = milesBeforeRunningOutOfGas + miles;
        if(gallonsOfGas == 0) {
            System.out.println("You are out of gas!");
            mileage = mileage - miles;
            milesTillNextOilChange = milesTillNextOilChange + miles;
             milesBeforeRunningOutOfGas = milesBeforeRunningOutOfGas - miles;
        }
        else if(miles >= (gallonsOfGas * mpg)) {
            mileage = mileage - miles;
            milesBeforeRunningOutOfGas = milesBeforeRunningOutOfGas - miles;
            milesTillNextOilChange = milesTillNextOilChange + miles;
            milesBeforeRunningOutOfGas = (milesBeforeRunningOutOfGas + (gallonsOfGas * mpg));
            System.out.print("You drove " + (int)milesBeforeRunningOutOfGas + " miles before running out of gas.");
            mileage = mileage + (gallonsOfGas * mpg);
            milesBeforeRunningOutOfGas = milesBeforeRunningOutOfGas + (gallonsOfGas * mpg);
            milesTillNextOilChange = milesTillNextOilChange - (gallonsOfGas * mpg);
            gallonsOfGas = 0;
            milesBeforeRunningOutOfGas = 0;
        }
        else {gallonsOfGas = ((gallonsOfGas * mpg) - miles) / mpg;
            System.out.print("You drove " + (int)miles + " miles.");
        }    
    }
    
    /*****************************************************************
     * Prints a warning if the number of gallons is less than or equal
     * to zero, prints a warning message if the number of gallons
     * results in the tank overflowing but still fills the tank, or
     * adds the provided amount of gallons to the tank.
     * @param gallons must be in "int" or "double" form
     * @return none
     * *****************************************************************/
    public void addGas (double gallons) {
        if(gallons <= 0) {
            System.out.println("You have no gas!");
            gallons = 0;
        }
        gallonsOfGas = gallonsOfGas + gallons;
        if(gallonsOfGas > fullTank) {
            gallonsOfGas = fullTank;
            System.out.println("You overfilled the gas tank. You now have " + fullTank + " gallons in the tank.");
        }
        else {System.out.println("You added " + gallons + " gallons and now have " + gallonsOfGas + " gallons in the tank.");
        }
    }
    
    /*****************************************************************
     * The current mileage.
     * @return mileage
     * *****************************************************************/
    public double checkOdometer () {
        return (int)mileage;
    }
    
    /*****************************************************************
     * The current amount of gas in the car.
     * @return gallons of gas
     * *****************************************************************/
     public double checkGasGauge () {
        return gallonsOfGas;
    }
    
    /*****************************************************************
     * Checks if the oil needs or doesn't need to be replaced.
     * @return none
     * *****************************************************************/
    public void checkOil () {
        if(milesTillNextOilChange <= 0) {
         System.out.println("It's time for an oil change!");   
        }
        else {System.out.println("The oil looks OK for now."); 
        }
    }
   
    /*****************************************************************
     * Changes the oil and tells the user when the next oil change
     * is due.
     * @return none
     * *****************************************************************/
    public void changeOil () {
        milesTillNextOilChange = 3000;
        System.out.println("You just added oil, the next change should occur at " + (int)(milesTillNextOilChange + mileage) + " miles.");
    }
    
    /*****************************************************************
     * Prints the car's horn.
     * @return none
     * *****************************************************************/
        public void honkHorn() {
        System.out.println("Get Out Of The Way! Get Out Of The Way!");
    }  
}

 

[Drunkenfetus]

Sweet! Man!