Searching through an object Array and Deleting a specific object

Question

I'm currently working on a shopping cart program, the program works by adding objects to an ArrayList that then gets printed on a JTextArea . The program needs to have the functionality of removing items as well. The user will input a unique order number of the order they would like to remove, I know how to get the number they have inputted, but I don't know how I can then use that number to run through my Array and delete the correct object.

Iterate through the list, compare that number and remove the matching one. — jlordo
– jlordo, Commented Jul 24, 2013 at 9:33
how can I compare the number they entered with attributes of objects in the array list? — user2613957
– user2613957, Commented Jul 24, 2013 at 9:36
@radimpe That is not a duplicate. The question is not a duplicate (which is the core criteria), but even the selected answer isn't really relevant. — Duncan Jones
– Duncan Jones, Commented Jul 24, 2013 at 11:35
The closure went ahead anyway. I've voted to re-open - the suggested duplicate is not valid. — Duncan Jones
– Duncan Jones, Commented Jul 24, 2013 at 13:27

Duncan Jones · Accepted Answer · 2013-07-24 09:38:24Z

3

Use an Iterator to loop around your objects. Compare the relevant field in the object with the value from the user. If you get a match, remove the object and stop searching.

Iterator<OrderObject> iterator = yourList.iterator();
boolean found = false;

while (iterator.hasNext()) {
  OrderObject o = iterator.next();
  if (o.getSomeField() == numberFromUser) {
    iterator.remove();
    found = true;
    break;
  }
}

if (!found) {
   // opportunity here to alert user?
}

answered Jul 24, 2013 at 9:38

Duncan Jones

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2 Comments

user2613957 Over a year ago

Iterator<OrderObject> iterator = yourList.iterator(); while (iterator.hasNext()) { OrderObject o = iterator.next(); if (o.someField == numberFromUser) { iterator.remove(); break; } }

Sandiip Patil Over a year ago

I think he gave you the same code which you put in the comment. What you want to imply by that?

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