Simple (i think, i suck at java) code help - Overclock.net

DanC · 10-04-07

hey guys, i just started out in java and I'm just writing a simple program right now...maybe someone can help.

if I'm trying to make a new variable called "myCar" for the class called "Car", i type Car myCar = new Car();, I know that, but I need to put the miles per gallon in at the same time, so if the car got 50 miles per gallon, i'd write "Car myCar = new Car(50);", but i dont know how to add a parameter to a class, so I get an error when I type in the 50...heres my code so far:

Code:

public class Car
{
	public int myGas; //amount of gas (gallons)
	public int drive; //number of miles to drive
	public String myCar;
	
	public String getCar(String myCar)
	{
		return myCar;
	}
	
	public int addGas(int myGas)
	{
		return myGas;
	}
	
	public int drive(int drive)
	{
		return drive;
	}
	
	public static void main(String [] args)
	{
		Car myCar = new Car(); //# = miles per gallon
		myCar.addGas(100);
		myCar.drive(10);
	}
}

btw, i just started java like, 3 days ago and i know more than my teacher already, but its still not much. what i did up there was stuff i learned on ym own since i started, lol

*dangerousHobo* · 10-04-07

Inside the Car class you need a constructor that takes in an integer as a parameter

so something like

Code:

public class Car
{
	public int myGas; //amount of gas (gallons)
	public int drive; //number of miles to drive
	public String myCar;

      // Constructor
      public Car(int gas) {
           this.myGas = gas;
      }
	
	public String getCar(String myCar)
	{
		return myCar;
	}
	
	public int addGas(int myGas)
	{
		return myGas;
	}
	
	public int drive(int drive)
	{
		return drive;
	}
	
	public static void main(String [] args)
	{
		Car myCar = new Car(); //# = miles per gallon
		myCar.addGas(100);
		myCar.drive(10);
	}
}

C-bro · 10-04-07

Your methods weren't actually doing anything, so this is what I came up with.

Code:

public class Car
{
    public int myGas; //amount of gas (gallons)
    public int drive; //number of miles to drive
    public String myCar;
    private int mpg;

    public Car(int gasAmt, int milesPerGallon, String name){
        myGas = gasAmt;
        mpg = milesPerGallon;
        myCar = name;
        // initializing a new car, you specify the amount of gas, the name, and the mileage.
    }
    
    
    public String getCar()
    {
        return myCar;
    }
    
    public int addGas(int moreGas)
    {
        myGas += moreGas; //add gas to the current amount
        return myGas;        // returns your new amount of gas
    }
    
    public int drive(int dist)
    {
        myGas - (dist*mpg);    // subtract the amount of gas to drive
        return myGas;    // returns the amount of gas you have left
    }
    
    public static void main(String [] args)
    {
        Car myCar = new Car(50,25,"Viper"); //# = miles per gallon
        myCar.addGas(100);
        myCar.drive(10);
    }
}

ra2shadow · 10-04-07

Quote:

Originally Posted by C-bro

Your methods weren't actually doing anything, so this is what I came up with.

Code:

public class Car
{
    public int myGas; //amount of gas (gallons)
    public int drive; //number of miles to drive
    public String myCar;
    private int mpg;

    public Car(int gasAmt, int milesPerGallon, String name){
        myGas = gasAmt;
        mpg = milesPerGallon;
        myCar = name;
        // initializing a new car, you specify the amount of gas, the name, and the mileage.
    }
    
    
    public String getCar()
    {
        return myCar;
    }
    
    public int addGas(int moreGas)
    {
        myGas += moreGas; //add gas to the current amount
        return myGas;        // returns your new amount of gas
    }
    
    public int drive(int dist)
    {
        myGas - (dist*mpg);    // subtract the amount of gas to drive
        return myGas;    // returns the amount of gas you have left
    }
    
    public static void main(String [] args)
    {
        Car myCar = new Car(50,25,"Viper"); //# = miles per gallon
        myCar.addGas(100);
        myCar.drive(10);
    }
}

Im rep+ on that i was in the middle of typing that......quickly done.

DanC · 10-04-07

wow, thanks to everybody! i really appreciate it...now my program works, woo!

kdbolt70 · 10-04-07

man... I always get here too late...

nice work guys!

*discretely points hobo towards my linux post....*

*dangerousHobo* · 10-04-07

Quote:

Originally Posted by kdbolt70

man... I always get here too late...

nice work guys!

*discretely points hobo towards my linux post....*

I'll add you to my queue of people to help tonight.

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Simple (i think, i suck at java) code help

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