import com.google.gwt.cell.client.CompositeCell; //导入依赖的package包/类
private com.google.gwt.user.cellview.client.Column initActionsColumn() {
    List<HasCell<DataGridFilterSummary, ?>> cells = new LinkedList<HasCell<DataGridFilterSummary, ?>>();

    cells.add(new RemoveActionHasCell("Remove",
                                      new ActionCell.Delegate<DataGridFilterSummary>() {
                                          @Override
                                          public void execute(DataGridFilterSummary filter) {
                                              gridPreferenceStore.removeCustomFilter(filter.getFilterName());
                                              refreshGrid();
                                          }
                                      }));

    CompositeCell<DataGridFilterSummary> cell = new CompositeCell<DataGridFilterSummary>(cells);
    com.google.gwt.user.cellview.client.Column<DataGridFilterSummary, DataGridFilterSummary> actionsColumn = new com.google.gwt.user.cellview.client.Column<DataGridFilterSummary, DataGridFilterSummary>(
            cell) {
        @Override
        public DataGridFilterSummary getValue(DataGridFilterSummary object) {
            return object;
        }
    };
    return actionsColumn;
}
 

import com.google.gwt.cell.client.CompositeCell; //导入依赖的package包/类
public UserCommandColumn(CompositeCell<AssistedObject> cell) {
    super(cell);
}