changes the layout orientation so that its items are displayed top-to-bottom and left-to-right.
import javax.swing.JList; import javax.swing.JScrollPane; public class Main { public static void main(String[] argv) throws Exception { String[] items = { "A", "B", "C", "D" }; JList list = new JList(items); JScrollPane scrollingList = new JScrollPane(list); // Change orientation to top-to-bottom, left-to-right layout list.setLayoutOrientation(JList.VERTICAL_WRAP); } }