是否可以在java swing中从ListSelectionEvents中提取字符串？

Posted 2021-04-03

我在java swing中使用字符串的JList。我想要一个ListSelectionListener，它返回用户选择的Listentry的String。但我无法达到弦本身。我唯一能找到的东西

private void registerListeners()
{
    gui.getListMeasurements().addListSelectionListener(new ListSelectionListener()
    {

        @Override
        public void valueChanged(ListSelectionEvent event)
        {
            System.out.println(event.getSource());

        }
    });
}

输出以下4次：javax.swing.JList [，0,0,240x340，alignmentX = 0.0，alignmentY = 0.0，border =，flags = 50331944，maximumSize =，minimumSize =，preferredSize =，fixedCellHeight = -1，fixedCellWidth = - 1，horizo​​ntalScrollIncrement = -1，selectionBackground已= javax.swing.plaf.ColorUIResource [R = 184，G = 207，b = 229]，selectionForeground = sun.swing.PrintColorUIResource [R = 51，G = 51，b = 51] ，visibleRowCount的= 8，layoutOrientation = 0]

此输出中的任何内容都不是指列表中选定的字符串。我也找不到任何有用的方法。是否有可能按照我描述的方式提取字符串？

答案

gui.getListMeasurements().addListSelectionListener(new ListSelectionListener() {
    @Override
    public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting()) {
            return;
        }
        if (e.getSource() instanceof JList) {
            JList list = (JList) e.getSource();
            int index = list.getSelectedIndex();
            Object element = list.getModel().getElementAt(index);
            if (element instanceof String) {
                System.out.println("Selected value at " + index + " = " + element);
            }
        }
    }
});

有用的网址：

• How to Use Lists
• JavaDocs for JList
• How to Write a List Selection Listener
• JavaDocs for ListSelectionListener和ListSelectionEvent