Thread: Edit ArrayList Object

Deleted since my college will scan using turnitin.com

I suspect it may be because you have the variable that holds the inventory declared static inside of CarsSubProduct. Change it to be non-static, and then you can get the object reference using the ArrayList.get() method:

CarsSubProduct car = products.get(0); // get the first car in the list
car.soldOne(); // decrement the inventory of car by one

Override the equals method of your CarsSubProduct class (or whatever you are putting into the ArrayList) so that it will test equality by the name:

public boolean equals(Object o)
{
     if (o instanceof String)
     {
          return (this.name.equals(o.toString());
     }
     else
     {
          return false;
     }
}

Then assuming each ArrayList you have will only have 1 Ford_Mustang, you can use the indexOf method to find it:

int index = car.indexOf("Ford_Mustang");

indexOf returns -1 if it doesn't find the object you want.

Post your CarName class... I have a feeling the error is somewhere in there.

I need the CarMethods class. Could you post that as well?

Deleted since my college will scan using turnitin.com

You forgot to over-write the the equals method in the CarMethods class

public boolean equals(Object o)
{
     if (o instanceof String)
     {
          return (this.name.equals(o.toString());
     }
     else
     {
          return false;
     }
}

Deleted since my college will scan using turnitin.com

hmm.. it seems that the indexOf method compares the types first (kind of annoying )

An easy way around this is to create a "dummy" CarMethods object that has the name, but nothing else.

So:

Cars.indexOf(new CarMethods("Ford_Mustang",0,0,0));

You'll also need to change the .equals() method to this:

	public boolean equals(Object o)
	{
		if (o instanceof String)
		{
			return (this.carsnames.equals(o));
		}
 
		else if (o instanceof CarMethods)
		{
			return (this.carsnames.equals(((CarMethods) o).carsnames));
		}
		else
		{
			return false;
		}
	}

will give you the indexOf the first Ford_Mustang in the ArrayList. The alternative is to iterate through the entire ArrayList of Cars, which isn't too hard.

public int customIndexOf(ArrayList<CarMethods> cars, String toFind)
{
     for (int i = 0; i < cars.size(); i++)
     {
          if (cars.get(i).equals(toFind))
           {
               return i;
          }
     }
     return -1;
}