Getting a value from an ArrayList java

Question

I am trying to get a value from with in an ArrayList. I have two classes, the main and a Car class. here is the code:

  public class CarOrders {
     public static void main (String [] args){
        Car toyota= new Car("Toyota", "$10000", "300"+ "2003");
        Car nissan= new Car("Nissan", "$22000", "300"+ "2011");
        Car ford= new Car("Ford", "$15000", "350"+ "2010");

        ArrayList<Car> cars = new ArrayList<Car>();
        cars.add(toyota);        
        cars.add(nissan);
        cars.add(ford);
     }

public static void processCar(ArrayList<Car> cars){
       int totalAmount=0;
       for (int i=0; i<cars.size(); i++){
          cars.get(i).computeCars ();
         totalAmount+= ?? 
      // in need to add the computed values of totalprice from the Car class?

       }
      System.out.println (totalAmount);

    }


}    
class Car {
     public Car (String name, int price, int, tax, int year)
     {
       constructor.......
     }

     public void computeCars ()
     {
      int  totalprice= price+tax;
      System.out.println (name + "\t" +totalprice+"\t"+year );
     }

}

How would i be able to calculate totalAmount in the processCar() method where totalAmount=totalAmount+totalPrice from the computCar() method in the Car Class?

Make computeCars() return totalprice. Thus totalAmount += cars.get(i).computeCars (); — Reno
– Reno, Commented Oct 31, 2011 at 8:32

masoud · Accepted Answer · 2011-10-31 08:38:44Z

1

Just return price+tax; from computeCars() :

 public int computeCars ()
 {
  return price+tax;
 }

then :

    public static void processCar(ArrayList<Car> cars){
       int totalAmount=0;
       for (int i=0; i<cars.size(); i++){
         totalAmount+= cars.get(i).computeCars(); 
       }
      System.out.println (totalAmount);
    }

edited Oct 31, 2011 at 8:38

answered Oct 31, 2011 at 8:31

masoud

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Comments

Howard · Accepted Answer · 2011-10-31 08:30:04Z

1

I'd suggest you change the signature of your computCar() method

public int computeCar() { ... }

and return the totalPrice as value from this method call. Thus you can use it in your method processCar().

answered Oct 31, 2011 at 8:30

Howard

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Comments

Upul Bandara · Accepted Answer · 2011-10-31 08:31:08Z

0

public int  computeCars ()
     {
      return price+tax;

     }


public static void processCar(ArrayList<Car> cars){
       int totalAmount=0;
       for (int i=0; i<cars.size(); i++){

         totalAmount=+ cars.get(i).computeCars ();
      // in need to add the computed values of totalprice from the Car class?

       }
      System.out.println (totalAmount);

    }

answered Oct 31, 2011 at 8:31

Upul Bandara

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Comments

Mazen313 · Accepted Answer · 2011-10-31 08:34:11Z

-1

You need to make some changes in you Car class, it should be like this:

class Car {
 //i'm adding only 2 properties you can add all the properties
 public int price;
 public int tax;
 public Car (String name, int price, int tax, int year)
 {
   //here you should add these 2 lines
   this.price=price;
   this.tax=tax;
 }

and you function will be:

  public static void processCar(ArrayList<Car> cars){
   int totalAmount=0;
   for (int i=0; i<cars.size(); i++){
      cars.get(i).computeCars ();
     totalAmount=+ cars.get(i).price;
  // in need to add the computed values of totalprice from the Car class?

   }
  System.out.println (totalAmount);

}

answered Oct 31, 2011 at 8:34

Mazen313

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