Instantiating an array with object of another class

I can't figure out why I'm not getting the String representation
of "item" from my toString. I'm getting an incompatible type error
Please point me in the right direction.
Here's my code:

Code:

---

public class Shopping
{
 private static Cart [] carts;
public static void main ( String[] args)
{   
    int numOfCarts = 2;
    carts = new Cart[ numOfCarts]; // create a Cart array of multiple carts

    // add logic to process each cart in the array here

    int numOfItems = 5;
    String typeSize = "Medium";
    String typeSeat = "Regular";

    carts[0] = new Cart(numOfItems, typeSize, typeSeat); // creates a cart object with values

    String itemName = "apple";   
    double itemPrice = .50;
    int itemQuantity = 5;

    Item item = new Item(itemName, itemPrice, itemQuantity); //instantiates item

   
    String s = "";
    s = item;

    carts[0].addItemToCustomerCart(item);

    System.out.println(carts);

}// end method main
@Override //return String representation of Item object
public String toString()
{
    String cartString = "";
    for ( Cart cart : carts )
    {
        cartString += cart + "/n";
    }
    return String.format( " %s", cartString );
    }

}//end class Shopping


import java.util.ArrayList;

public class Cart
{
    private String sizeType;
    private String seatType;
    private ArrayList <Item> items;

    //no argument constructor creates a cart with a default size (10)
    public Cart()
    {

    } // end no argument constructor
    public Cart( int n, String s, String t)
    {
        int initNbrOfItems = n > 0? n : 10; // validate
       
        items = new ArrayList< Item >( initNbrOfItems ); //create ArrayList
        setSizeType(s);
        setSeatType(t);
    } // end three parameter constructor
    public void addItemToCustomerCart( Item I)
    {
        items.add( I );
        for ( Item item : items )
        {
            System.out.println(item);
        }
    } //end method addItemToCustomerCart
    public void setSizeType(String Size)
    {
        sizeType = Size;
    } //end method setSizeType
    public void setSeatType(String Seat)
    {
        seatType = Seat;
    } // end method setSeatType
    public String getSizeType()
    {
        return sizeType;
    } //end method getSizeType
    public String getSeatType()
    {
        return seatType;
    } //end method getSeatType
@Override //return String representation of each element in Item ArrayList
public String toString()
{
    String itemString = "";
    for ( Item item : items )
    {
        itemString += item + "/n";
    }
    return String.format( " %s", itemString );

}//end method toString

} //end class Cart


public class Item
{
    private String iName;
    private double iPrice;
    private int iQuantity;

    // no argument constructor
    public Item()
    {}// no argument constructor
    public Item(String n, double p, int q)
    {
        setIName(n);
        setIPrice(p);
        setIQuantity(q);
    }// end three parameter constructor
    public void setIName(String name)
    {
        iName = name;
    } //end method setIName
    public void setIPrice(double price)
    {
        iPrice = price;
    } // end method setIPrice
    public void setIQuantity(int quantity)
    {
        iQuantity = quantity;
    } // end method setIQuantity
    public String getIName()
    {
        return iName;
    } //end method getIName
    public double getIPrice()
    {
        return iPrice;
    } //end method getIPrice
    public int getIQuantity()
    {
        return iQuantity;
    } //end method getIQuantity
    // return String representation of the Item object
    @Override
    public String toString()
    {
        return String.format( "%s %d %d\n",
                iName, iPrice, iQuantity );
    }// end method toString for the item object
}//end class Item

---

ArrayList<Carts> leArray = new ArrayList<Carts>();

Can you tell us more, specifically, what line is causing the error and what is the exact error message?

The compiler error is at line 24 and 25 above
incompatible type
Required: java.lang.String
found: Item

These are lines 24 and 25:

Code:

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    String s = "";
    s = item;

---

Why do you think you can assign an Item reference to a String reference?

In the line 25
string can not be referened to a object directly. If give reference then it will throw the exception like incompatible type.
if you want Item object reference to a string then you need do Item.toString().
Then exception will not occur.

Do you need to call the Item class's toString method?

Quote:

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Originally Posted by dinesh.guntha

In the line 25
string can not be referened to a object directly. If give reference then it will throw the exception like incompatible type.
if you want Item object reference to a string then you need do Item.toString().
Then exception will not occur.

---

Which is only a solution if the OP actually wants the result of the toString referenced by 's'.
Since 's' is not used in the above code they may intend something else entirely, and your 'fix' is simply a way to get things to compile.

It converts the item class object reference to string.
what is requirement we dont know, but he is laking at that place. so that i tryed to explain that error & how to overcome from that error.

Just fixing the cosmetic error may not fix the underlying problem, that's all I'm saying.
I see it too often in bug fixes...

Thanks for all the help. To get the program to compile I changed line 24 to read
s += item; That forces Item item into a string.

The simple way would be to call the Item class's toString() method:
String s = item.toString();