### Question:
JXList extends JList { public void toggleSortOrder() { if (hasSortController()) getSortController().toggleSortOrder(0); } JXList();  JXList(ListModel dataModel);  JXList(Object[] listData);  JXList(Vector<?> listData);  JXList(boolean autoCreateRowSorter);  JXList(ListModel dataModel, boolean autoCreateRowSorter);  JXList(Object[] listData, boolean autoCreateRowSorter);  JXList(Vector<?> listData, boolean autoCreateRowSorter); Searchable getSearchable(); void setSearchable(Searchable searchable); @Override int getNextMatch(String prefix, int startIndex, Bias bias); void setRolloverEnabled(boolean rolloverEnabled); boolean isRolloverEnabled(); @Override Point getPopupLocation(MouseEvent event); Point getPopupTriggerLocation(); boolean getAutoCreateRowSorter(); void setAutoCreateRowSorter(boolean autoCreateRowSorter); RowSorter<? extends ListModel> getRowSorter(); void setRowSorter(RowSorter<? extends ListModel> sorter); void setSortable(boolean sortable); boolean isSortable(); void setSortsOnUpdates(boolean sortsOnUpdates); boolean getSortsOnUpdates(); void setSortOrderCycle(SortOrder... cycle); SortOrder[] getSortOrderCycle(); Comparator<?> getComparator(); void setComparator(Comparator<?> comparator); @SuppressWarnings("unchecked") void setRowFilter(RowFilter<? super R, ? super Integer> filter); @SuppressWarnings("unchecked") RowFilter<?, ?> getRowFilter(); void resetSortOrder(); void toggleSortOrder(); void setSortOrder(SortOrder sortOrder); SortOrder getSortOrder(); Object getElementAt(int viewIndex); @Override Object getSelectedValue(); @Override void setSelectedValue(Object anObject,boolean shouldScroll); @Override Object[] getSelectedValues(); int getElementCount(); int convertIndexToModel(int viewIndex); int convertIndexToView(int modelIndex); @Override void setModel(ListModel model); void setHighlighters(Highlighter... highlighters); Highlighter[] getHighlighters(); void addHighlighter(Highlighter highlighter); void removeHighlighter(Highlighter highlighter); String getStringAt(int row); @Override ListCellRenderer getCellRenderer(); ListCellRenderer getWrappedCellRenderer(); @Override void setCellRenderer(ListCellRenderer renderer); void invalidateCellSizeCache(); @Override void updateUI(); @Override String getUIClassID(); final static String uiClassID; static final String EXECUTE_BUTTON_ACTIONCOMMAND; }### Answer:
@Test public void testToggleSortOrder() { JXList list = new JXList(ascendingListModel, true); assertSame(SortOrder.UNSORTED, list.getSortOrder()); list.toggleSortOrder(); assertSame(SortOrder.ASCENDING, list.getSortOrder()); list.toggleSortOrder(); assertSame(SortOrder.DESCENDING, list.getSortOrder()); list.resetSortOrder(); assertSame(SortOrder.UNSORTED, list.getSortOrder()); }