动态地将列添加到JTable

Question

我有一个空的JTable,绝对没有.我需要以某种方式动态生成其表列.我尝试的代码的简化版本:

@Action
public void AddCol() {
    for (int i = 0; i < 10; i++) {
        TableColumn c = new TableColumn(i);
        c.setHeaderValue(getColNam(i));
        table.getColumnModel().addColumn(c);
    }
}

但我得到了一个

线程"AWT-EventQueue-0"中的异常java.lang.ArrayIndexOutOfBoundsException:0> = 0

我究竟做错了什么？

如果它有帮助,这是完整的堆栈跟踪:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
        at java.util.Vector.elementAt(Vector.java:427)
        at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:632)
        at engine.Processor$UpdateTable.run(Processor.java:131)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Answer 1

我认为您需要将列添加到表的数据模型及其列模型中.当数据模型更改时,列模型会更新,因此更改数据模型应该足够了.这是一个例子:

public class TableColumnAdd {
    private static DefaultTableModel tableModel;
    private static int columnNumber = 1;

    public static void main(String[] args) throws InterruptedException, InvocationTargetException {
        SwingUtilities.invokeAndWait(new Runnable() {
            @Override
            public void run() {
                tableModel = new DefaultTableModel(new Object[] { "Initial Column" }, 5);
                JTable table = new JTable(tableModel);
                JFrame frame = new JFrame("Table Column Add");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setBounds(100, 100, 600, 300);
                frame.add(new JScrollPane(table));
                frame.setVisible(true);
            }
        });

        for (;;) {
            SwingUtilities.invokeLater(new Runnable() {
                @Override
                public void run() {
                    tableModel.addColumn("Column #" + columnNumber++);
                }
            });
            Thread.sleep(2000);
        }
    }
}