Iterating an ArrayList to return a value

Question

I am having trouble seeing the error of my work: I am creating an iterator (in my class LamborghiniCarLot) which will give the number of vehicles in my (ArrayList inventory;) which are rear-wheel-drive. the Lamborghini class has a method called getIsRearWheelDrive(). But attempting to call it, I get the method not found. "inventory" is the field variable holding the arraylist. Here is my code as it stands:

public int howManyAreRearWheelDrive()
{
    int numberRearWheel = 0;
    Iterator<Lamborghini> it = inventory.iterator();
    Lamborghini inv = null;

    while(it.hasNext())
    {
        inv = it.next();
        if(inv != null)
        {
            if(it.getIsRearWheelDrive() == true)
            {
                numberRearWheel ++;
            }
        }
    }
    return numberRearWheel;
}

Kon · Accepted Answer · 2015-04-11 22:07:26Z

2

if(it.getIsRearWheelDrive() == true)

should be

if(inv.getIsRearWheelDrive() == true)

answered Apr 11, 2015 at 22:07

Kon

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1 Comment

Paul Boddington Over a year ago

or just if(inv.getIsRearWheelDrive()).

AlecR · Accepted Answer · 2015-04-11 22:09:04Z

0

Instead of it.getIsRearWheelDrive() you need to use inv.getIsRearWheelDrive() since your Lamborghini class has the method. it is your iterator and an iterator does not have a getIsRearWhileDrive() method.

answered Apr 11, 2015 at 22:09

AlecR

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Comments

Tesseract · Accepted Answer · 2015-04-11 22:10:01Z

0

I would use a for loop

for(Lamborghini inv: inventory) {
  if(inv.getIsRearWheelDrive()) numberRearWheel++;
}

or a Stream

public int howManyAreRearWheelDrive() {
  return (int)inventory.stream().filter(inv -> inv.getIsRearWheelDrive()).count();
}

answered Apr 11, 2015 at 22:10

Tesseract

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