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:

Code :

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

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Thanks,i tried your method and now i can specify which object i want to get in the array like


int price=Cars.get(0).getprice();

But now i want to search all the indexes and get the index which contains for example Ford_Mustang then i use another syntax as such above to get the price

Cars.add( new CarMethods( "Ford_Mustang",1,1000,10000 ) );

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:

Code :

---

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

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

Code :

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

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Thanks will do as explained

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

Even when i initialize Carname and run on netbeans debugger,Carname still appears as null

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 :P

Code :

---

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

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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:

Code :

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

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

Code :

---

	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;
		}
	}

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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.

Code :

---

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;
}

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