Java Utililty Methods JList

void applyDefaultProperties(final JList comp)
Sets default background and foreground color as well as a default font for the specified component.

if (comp == null) {
 return;
applyProperties(comp, "List.background", 
 "List.foreground", 
 "List.font"); 

void clearList(JList list)
fillList

setListModel(generateListModel(), list);

void ensureCustomBackgroundStored(JList comp)
ensure Custom Background Stored

if (getStoredBackground(comp) != null)
 return;
Color background = comp.getBackground();
if ((background == null) || (background instanceof UIResource) || (background == WARNING_BACKGROUND)
 || (background == ERROR_BACKGROUND))
 return;
comp.putClientProperty(STORED_BACKGROUND_KEY, background);

void ensureRangeIsVisible(JList list, int top, int bottom)
ensure Range Is Visible

int size = list.getModel().getSize();
if (top < 0) {
 top = 0;
if (bottom >= size) {
 bottom = size - 1;
Rectangle cellBounds = list.getCellBounds(top, bottom);
...

void filterDataList(JList jList, List dataList, String text)
filter Data List

jList.setListData(new Object[] {});
List newList = new ArrayList();
dataList.stream().filter((ob) -> (ob.toString().toLowerCase().startsWith(text.toLowerCase())))
 .forEach((ob) -> {
 newList.add(ob);
 });
jList.setListData(newList.toArray());

Color getStoredBackground(JList comp)
get Stored Background

return (Color) comp.getClientProperty(STORED_BACKGROUND_KEY);

int getVisibleRowCount(JList list)
get Visible Row Count

return list.getLastVisibleIndex() - list.getFirstVisibleIndex() + 1;

int indexList(JList list, Object object)
index List

ListModel model = list.getModel();
if (model == null) {
 model = new DefaultListModel();
 list.setModel(model);
;
if (model instanceof DefaultListModel) {
 DefaultListModel listModel = (DefaultListModel) model;
...

int indexOf(JList jList, Object obj)
index Of

ListModel model = jList.getModel();
int i;
for (i = model.getSize() - 1; i >= 0; i--)
 if (model.getElementAt(i) == obj)
 break;
return i;

boolean isDoubleClick(MouseEvent evt, JList lst, JButton btn)
Enable the associated button if single click.

if (lst.getMinSelectionIndex() >= 0) {
 switch (evt.getClickCount()) {
 case 1:
 btn.setEnabled(true);
 break;
 case 2:
 if (btn.isEnabled()) {
 return true;
...