错误：java。lang.ArrayIndexOutOfBoundsException:0>=0

Question

帮助，我不能删除表中的最后一行。当我删除其他记录时没有错误，但是最后一个记录，我不能删除它

这是我的代码：

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    int row = table1.getSelectedRow();
    if(row >= 0){
    int opt = JOptionPane.showConfirmDialog(null, "Confirm to Delete?", "Delete", JOptionPane.YES_NO_OPTION);
    if(opt==0){
    try{
    Class.forName("com.mysql.cj.jdbc.Driver");
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3307/finals?zeroDateTimeBehavior=CONVERT_TO_NULL", "root", "");
    DefaultTableModel model = (DefaultTableModel) table1.getModel();
    model.removeRow(row);
    String value = (table1.getModel().getValueAt(row, 0).toString());
    String query = "DELETE FROM student WHERE id_num = '"+ value + "'";
    PreparedStatement pst = conn.prepareStatement(query);
    pst.executeUpdate(query);
    JOptionPane.showMessageDialog(this, "Deleted Successfully. \nYour record has been updated.", "Success", JOptionPane.INFORMATION_MESSAGE); 
    }
    catch(Exception ex){ex.printStackTrace();}
    }
    }
    else{JOptionPane.showMessageDialog(this, "Please select a record.", "Error", JOptionPane.INFORMATION_MESSAGE);}
}       

Answer 1

我怀疑异常是在String value= getValueAt（行，0）表达式进行编码。

如果是这种情况，我想您需要切换这两行：

model.removeRow(row);
String value = (table1.getModel().getValueAt(row, 0).toString());

如果删除最后一行，则表模型为空。这就是为什么getValueAt（行，0）将抛出ArrayIndexOutOfBoundsException。