adding items to arraylist through constructor

[Randy Smith]

Thank you for responding =)

public abstract class Item{

private String title;
private int qty;
private double price;

//Recommend other stuffs
private ArrayList<String> recommendations;

public Item(String title, double price, int qty) {
			
		this.title = title;
		this.price = price;
		this.qty = qty;
		this.Recommendations = new ArrayList<String>();
      }  
}
  
public class Wallet extends item{  

private String material;

public Wallet(String title, double price, int qty, String material) {

super(title, price, qty);
this.material = material;
		
}
}

public class Inventory{

private ArrayList<Item> Inventory;

public Inventory() {
this.store= new ArrayList<Item>();
}

public void addItem(Item item) {
		
		Inventory.add(item);
	}

}


public class Test{

Inventory inventory = new Inventory();

//this add items to Inventory

private static void setInventory(Inventory inventory) {

inventory.additem(new Wallet("Prada", 99.00, 35, "Leather"));

}

for this piece of code

inventory.additem(new Wallet("Prada", 99.00, 35, "Leather"));

I'll also like to add a list of recommendations into Wallet's arraylist when item is added to inventory. I've been fetting for hours...pouring into tutorial and code samples. how can this be done?

[John Jai]

Please post the real code. My choice will be to construct the recommendations in a List<String> in the Test class and just assign it to the Item class recommendations List. Please use List<String> rather than ArrayList<String>.

If you still want to assign recommendations in the Item class constructor, then you can pass a String array objects and add each recommendation String into the ArrayList like below.

List<String> recommendations;
	public AddArrayList(String [] input){
		recommendations = new ArrayList<String>();
		for(String recommendation : input){
			recommendations.add(recommendation);
		}
	}

[John Jai]

And please PostRealCode... for sample the Wallet class is shown as extending the Product class but according to the context it should be Item.. Or else the Product class definition is not posted.

[Randy Smith]

John Jai wrote:And please PostRealCode... for sample the Wallet class is shown as extending the Product class but according to the context it should be Item.. Or else the Product class definition is not posted.

i've fixed those bits, do you mean there is no way I can add Strings to Recommendation arraylist as I instantiate "wallet"?

[Ernest Friedman-Hill]

Randy Smith wrote:
i've fixed those bits, do you mean there is no way I can add Strings to Recommendation arraylist as I instantiate "wallet"?

Not as it stands, because Wallet doesn't provide any way to do it. Add a List<String> or String[]constructor parameter, though, and then it'd be easy.

[Randy Smith]

Ernest Friedman-Hill wrote:

Randy Smith wrote:
i've fixed those bits, do you mean there is no way I can add Strings to Recommendation arraylist as I instantiate "wallet"?

Not as it stands, because Wallet doesn't provide any way to do it. Add a List<String> or String[]constructor parameter, though, and then it'd be easy.

how about this?

public abstract class Item{  
  
private String title;  
private int qty;  
private double price;  
  
//Recommend other stuffs  
private ArrayList<String> recommendations;  
  
public Item(String title, double price, int qty, String recommendation) {  
              
        this.title = title;  
        this.price = price;  
        this.qty = qty;  
        this.Recommendations = new ArrayList<String>();  
      } 

public void addRecommendations(String recommendation) {
        Recommendations.add(recommendation);
    }
}  
    
public class Wallet extends item{    
  
private String material;  
  
public Wallet(String title, double price, int qty, String recommendation,String material) {  
  
super(title, price, qty);
super.addRecommendations(recommendation);
this.material = material;        
    }  
}    
  
public class Test{
  
Inventory inventory = new Inventory();  
  
//this add items to Inventory  
  
private static void setInventory(Inventory inventory) {  
  
inventory.additem(new Wallet("Prada", 99.00, 35, "Gucci", "Leather"));  
  
}  

I've tested the above code and it does work. I would love more input if there's a better way.