JList 中的多区间选择

Question

我想从 JList 中进行多项选择 ("columns")。如何获取 JList 中所有选定项目的字符串值，并在按下 ("Export") 按钮后将它们放入字符串的 array/ArrayList 中？

我的构造函数中有这个：

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);
}

在同一个 class 里面是 class:

class ExportListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        String columnName = (String) list.getSelectedValue();
        selectedCols.add(columnName); // add to array list
    }
}

现在我知道这行不通了。这将仅适用于一个选定的值。如何进行多项选择？

Answer 1

class ExportListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        String[] columnsSelected;
        columnsSelected = new String[list.getSelectedValuesList().size()];
        columnsSelected = (list.getSelectedValuesList()).toArray(columnsSelected);      
    }
}

我可以这样做。

Answer 2

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);

JList 中的多区间选择

Multiple Interval Selection in JList

selection

jlist