将对象传递给ArrayList Java

Question

I am trying to pass 5 objects of 3 types into an array list. When I print the list all values are zero. I've tried amending the object types but still no result, can anyone help?

//Item is a Class by itself and the 5 objects draw from this but will have 2/3 additional parameters
ArrayList<Item> inventory = new ArrayList<>();

//Item 1
 Dvd dvd1 = new Dvd(1234567, 2001, "Sugar were going down", "15", "Comedy DVD", 2, 180, "Japanese");

//Item 2
 Dvd dvd2 = new Dvd(7654321, 2005, "The only way is up!", "12A", "Comedy DVD", 3, 220, "Greek, Spanish, Italian");

And so on.. Now my output looks like this:

ID: 0
Year: 0
Title: 
Classification: 
Genre: 
Return Date: 25/5/2014
Available: true

Any Suggestions?

Code for Adding Objects:

 inventory.add(dvd1);
 inventory.add(dvd2);

Print Code:

for(int i = 0; i<= inventory.size(); i++){
    System.out.println(inventory.get(i));
}

Answer 1

Your DVD Class should override the toString() Method and there you will have to create the String you want to see in your output.

public class ....
.....
    public String toString() {
        return "I am a DvD";
    }
}

this would return "I am a DvD" each time you call system.out.priontln(inventory.get(i));

That means you will do something like

StringBuilder sb = new StringBuilder("");
sb.append("ID: " + <IDVariable>);
sb.append("\nYear: " + <YearVariable>);   //<<<< \n means new Line
....
return sb.toString(); 

Answer 2

As you have the Dvd class make the 8 fields that have initialized in the constructor as private then implement the getters for those fields

Then in the implmentation class create the arraylist as :

List<Dvd> inventory = new ArrayList<Dvd>();

then add the objects initilized to the list. Then you can obtain the values from the list by iterating the list as :

for(Dvd dvd : inventory)

dvd will give you the dvd objects then just call the getters on it

Answer 3

Got it resolved, simple mistake, failed to call super()

=/