為什么JTableHeader上的MouseListener拋出ArrayIndexOutOfBoundsException？

Question

我只是從揮桿開始，但是在這個問題上我已經停留了大約一周的時間，並且嘗試了所有我能想到的。 我試圖通過單擊列標題並獲取ArrayIndexOutOfBoundsException的結果來更新表模型。

我在這里簡化了代碼，但是有人可以解釋一下為什么：

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));
            }
        });
    }
}

單擊時拋出此錯誤？：

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)

編輯你們中有些人問為什么在單擊列標題時為什么要更改模型。 在我的應用程序中，表格列代表學校作業。 單擊標題后，它會打開一個對話框，允許用戶修改或刪除分配。 如果用戶單擊刪除，我想從表中刪除該列。 但是，每當我嘗試在點擊處理程序中更改表結構時，都會收到此錯誤。

Answer 1

MouseListener必須正在執行某些處理，並且不喜歡您在處理過程中更改數據。

嘗試：

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

這將使MouseListener代碼在更改模型之前完成執行。

真正的問題是，為什么單擊標題時會更改模型？

編輯：

如MadProgrammer所述，第一個建議不起作用。

如果您只是想清除模型中的數據，那么可以使用另一種方法：

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

如果您想要一個結構完全不同的表，那么我建議您執行以下操作：

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