Question

我刚刚开始摇摆，但我已经坚持了这个问题大约一个星期，我已经尝试了所有我能想到的东西。我试图通过点击列标题并获得ArrayIndexOutOfBoundsException来更新表格模型。

我已经在这里简化了代码，但有人可以解释一下为什么：

package gradebook.model.courseTable;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;

public class CourseTableTest extends JTable {
    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
                public void run(){
                    JFrame frame = new JFrame();
                    frame.add(new JScrollPane(new CourseTable()));
                    frame.setVisible(true);
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                }
            });

        }

    public CourseTableTest(){
        super(3, 3);

        this.tableHeader.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                setModel(new DefaultTableModel(3, 3));
            }
        });
    }
}

单击时

会抛出这个？：

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.Vector.elementData(Unknown Source)
    at java.util.Vector.elementAt(Unknown Source)
    at javax.swing.table.DefaultTableColumnModel.getColumn(Unknown Source)
    at javax.swing.JTable.getCellRenderer(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintDraggedArea(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
    at javax.swing.plaf.ComponentUI.update(Unknown Source)
    at javax.swing.JComponent.paintComponent(Unknown Source)
    at javax.swing.JComponent.paint(Unknown Source)
    at javax.swing.JComponent.paintToOffscreen(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
    at javax.swing.RepaintManager.paint(Unknown Source)
    at javax.swing.JComponent._paintImmediately(Unknown Source)
    at javax.swing.JComponent.paintImmediately(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.access$700(Unknown Source)
    at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.Vector.elementData(Unknown Source)
    at java.util.Vector.elementAt(Unknown Source)
    at javax.swing.table.DefaultTableColumnModel.getColumn(Unknown Source)
    at javax.swing.JTable.getCellRenderer(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintDraggedArea(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
    at javax.swing.plaf.ComponentUI.update(Unknown Source)
    at javax.swing.JComponent.paintComponent(Unknown Source)
    at javax.swing.JComponent.paint(Unknown Source)
    at javax.swing.JComponent.paintToOffscreen(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
    at javax.swing.RepaintManager.paint(Unknown Source)
    at javax.swing.JComponent._paintImmediately(Unknown Source)
    at javax.swing.JComponent.paintImmediately(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.access$700(Unknown Source)
    at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

修改你们有些人问我为什么要在点击标题栏时更改模型。在我的应用程序中，表格列代表学校作业。单击标题时，将打开一个对话框，允许用户修改或删除分配。如果用户单击删除，我想从表中删除该列。但是每当我尝试在click处理程序中更改表结构时，我都会收到此错误。

Answer 1

MouseListener必须进行一些处理，并且不喜欢在处理过程中更改数据。

尝试：

SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
            setModel(new DefaultTableModel(3, 3));
    }
});

这将使MouseListener代码在更改模型之前完成执行。

真正的问题是，当您点击标题时，为什么要更改模型？

编辑：

如MadProgrammer所述，第一个建议不起作用。

如果您只是想清除模型中的数据，那么另一个黑客可以使用：

@Override
public void mousePressed(MouseEvent e)
{
    model.setRowCount(0);
    model.setRowCount(3);
}

如果你想要一个具有完全不同结构的表，那么我建议你做类似的事情：

@Override
public void mousePressed(MouseEvent e)
{
    scrollPane.setViewportView( new JTable(4, 4) );
}

为什么JTableHeader上的MouseListener抛出ArrayIndexOutOfBoundsException？

1 个答案: