我希望从JList中选择多个(" columns")。如何在JList中获取所有选定项的String值,并在按下一个(" Export")按钮后将它们放入Strings的数组/ ArrayList中?
我在构造函数中有这个:
public ColumnList(String[] allColumns) {
super(new BorderLayout());
listModel = createListModel(allColumns); // contains all the columns
list = new JList<String>(listModel);
list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
list.setSelectedIndex(0);
list.setVisibleRowCount(5);
JScrollPane listScrollPane = new JScrollPane(list);
exportButton = createExportButton(exportString);
}
同一类是这个内部类:
class ExportListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String columnName = (String) list.getSelectedValue();
selectedCols.add(columnName); // add to array list
}
}
现在我知道这不起作用。这只适用于一个选定的值。如何进行多项选择?
答案 0 :(得分:0)
class ExportListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
String[] columnsSelected;
columnsSelected = new String[list.getSelectedValuesList().size()];
columnsSelected = (list.getSelectedValuesList()).toArray(columnsSelected);
}
}
我能够这样做。
答案 1 :(得分:0)
在调用JList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION)后使用JList.setSelectedIndices(int [])
jList.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
int[] selectIndices = {0, 3};
jList.setSelectedIndices(selectIndices);