删除JTable的最后一行的问题 [英] Problem with removing last row of JTable

问题描述

这是我第一次在这里问，请原谅我有什么不当之处，如果我的英语不太好，请见谅.

This is my first time asking here so forgive me if something isn't appropriate, and sorry if my English isn't very good.

简而言之，目前，我正在使用Swing开发Java桌面应用程序，并且在使用表时遇到了问题.我有行，每行都有一个删除行的按钮.一切正常(我可以毫无问题地删除行)，直到尝试删除最后一行.可以删除最后一行，但显然存在例外，如下所示:

Well, to make it short, currently I'm developing a Java desktop app with Swing and I have a problem using table. I have rows with each row have a button to delete the row. Everything is okay (i can delete rows with no problem) until i try to delete the last row. The last row can be deleted but apparently there is an exception, something like this:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 4 >= 4
    at java.util.Vector.elementAt(Vector.java:427)
    at javax.swing.table.DefaultTableModel.setValueAt(DefaultTableModel.java:648)
    at javax.swing.JTable.setValueAt(JTable.java:2710)
    at javax.swing.JTable.editingStopped(JTable.java:4712)
    at javax.swing.AbstractCellEditor.fireEditingStopped(AbstractCellEditor.java:125)

从堆栈跟踪中，似乎"4"是我先前删除的最后一行索引，但是我不知道如何处理.我已经在寻找解决方案，但仍然无法解决.请注意，当我删除最后一行时，还有其他行，此后，我将无法删除其他行.当我单击删除按钮时，也会产生相同的例外情况.

From the stack trace, it seems that "4" is my previously deleted last row index, but i have no idea how to deal with this. I already search for solution but i still can't solve it. Note that there are still other rows when i delete the last row, and after that i can't delete the others rows. The same exception also resulted when i click the delete button.

哦.并且我使用DefaultTableModel中的removeRow()删除行.任何帮助将不胜感激.谢谢.

Oh. and I use removeRow() from DefaultTableModel to delete the row. Any help will be appreciated. Thanks.

编辑 这些是我使用的代码.

EDIT These are the code I use.

public class ViewDetail extends JInternalFrame implements ActionListener {
    ...
    String column[] = { "Aaa", "Bbb", "Delete This"};

    tableModel = new DefaultTableModel();
    Object row[][] = new Object[size][column.length];

    //fill the data from db
    int r = 0;
    for (int i = 0; i < size; i++) {
    row[r][0] = ...;
    row[r][1] = ...;
    row[r][2] = "Delete";
    r++;
    }

    tableModel.setDataVector(row, column);
    table = new JTable(tableModel);

    tableColumn = table.getColumn("Aaa");
    tableColumn.setPreferredWidth(75);
    tableColumn = table.getColumn("Bbb");
    tableColumn.setPreferredWidth(75);
    tableColumn = table.getColumn("Delete This");
    tableColumn.setPreferredWidth(75);
    tableColumn.setCellRenderer(new ButtonRenderer());
    tableColumn.setCellEditor(new ButtonEditor(new JCheckBox());
     ...
}

public class ButtonRenderer extends JButton implements TableCellRenderer {
    public ButtonRenderer() {
        setOpaque(true);
    }
    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {
        if (isSelected) {
            setForeground(table.getSelectionForeground());
            setBackground(table.getSelectionBackground());
        } else {
            setForeground(table.getForeground());
            setBackground(UIManager.getColor("Button.background"));
        }
        setText((value == null) ? "" : value.toString());
        return this;
    }
}

public class ButtonEditor extends DefaultCellEditor {
    protected JButton button;
    private String label;
    private boolean isPushed;
    private JTable table;
    public ButtonEditor(JCheckBox checkBox) {
    super(checkBox);
    button = new JButton();
    button.setOpaque(true);
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            fireEditingStopped();
            }
        });
    }

    public Component getTableCellEditorComponent(JTable table, Object value,
        boolean isSelected, int row, int column) {
    if (isSelected) {
        button.setForeground(table.getSelectionForeground());
        button.setBackground(table.getSelectionBackground());
    } else {
        button.setForeground(table.getForeground());
        button.setBackground(table.getBackground());
    }
    label = (value == null) ? "" : value.toString();
    button.setText(label);
    isPushed = true;
    this.table = table;
    return button;
    }

    public Object getCellEditorValue() {
    if (isPushed) {
                  DefaultTableModel tableModel = (DefaultTableModel) table.getModel();                            
                  tableModel.removeRow(table.getSelectedRow());                
            }
            isPushed = false;
    return new String(label);
    }

    public boolean stopCellEditing() {
    isPushed = false;
    return super.stopCellEditing();
}

protected void fireEditingStopped() {
        super.fireEditingStopped();
    }
}

推荐答案

Swing尝试将新值设置为要删除的行！尝试将删除代码移动到Runnable中，并使用swing工具类中的invokeLater来执行它.

Swing is trying to set the new value into the row you remove! Try moving the remove code into a Runnable and use invokeLater in the swing utility class to execute it.

这篇关于删除JTable的最后一行的问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！