Adding and removing elements from list during runtime

By default List don’t support methods to add/remove elements from list

Why ???

At the time of creation of List jList creates a ListModel object which stores

data of list and it does not support runtime addition or deletion of objects

For adding elements at runtime you need to change ListModel to DefaultListModel

How to do that ?

Here are the steps to do it.

·         Add a List to your Form

·         Right click on List and Select Properties

·         Now look for Model Property

·         Click ellipsis( button that look like [..]) which is in front of model property

·         Now a dialog box will open

·         Now select custom Code from Combobutton

·         And type code new DefaultListModel()  in the TextField. And click OK

·         Now Open Source Code

To desired event or method write the code

   //Getting ListModel in DefaultListModel

   DefaultListModel  dList = (DefaultListModel) list.getmodel();

//You can add Elements in list in two ways

// 1^st : adding item at the end of list

dList.addelement(“new item”);

//2^nd : Adding eelement at a specific index

dList.add(0,”new Item”);

//here 0 is the index

//to remove any element

dList.removeElementAt(index no);

//OR

dList.removeElement(“Element x”);