The items can be arbitrary objects. The toString() method of the objects is displayed in the list component. : JList Renderer « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JList Renderer

import javax.swing.JList;

public class Main {
  public static void main(String[] argv) throws Exception {
    Object[] items2 = { new Integer(123), new java.util.Date() };
    JList list = new JList(items2);
    
    
  }
}

14.41.JList Renderer
	14.41.1.	Rendering JList Elements
	14.41.2.	Install List cell renderer
	14.41.3.	Add your own ListCellRenderer
	14.41.4.	Creating a Complex ListCellRenderer: font, icon and color
	14.41.5.	The items can be arbitrary objects. The toString() method of the objects is displayed in the list component.
	14.41.6.	Setting the Dimensions of an Item in a JList Component
	14.41.7.	Set the item dimensions using a sample value
	14.41.8.	Change the layout orientation so that its items are displayed top-to-bottom and left-to-right.