我有一個帶有幾個文本框和一個保存按鈕的窗體。 按下按鈕時,應檢查某些文本字段是否爲空,如果這些字段爲空,則應顯示錯誤消息,否則應執行所需的任何工作。我已經編寫了代碼,但是這些字段是否爲空,它執行主要任務。有人可以提醒嗎?感謝Java驗證
final JButton button = new JButton("Save");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(textField_2.equals("") || textField_3.equals("") || textField_4.equals("") || textField_5.equals("") || textField_6.equals("") || textArea.equals("") || textField_7.equals("")) {
JOptionPane.showMessageDialog(frmModifyBooking, "Please fill in all fields indicated with a star (*).");
}
else {
try {
String sql = "UPDATE vacation SET `StaffID` =?, `From` =?, `To` =?, `TotalDays` =?, `VacationType` =?, `Notes` =?, `Signature` =?, `Date` =? WHERE VacationID = ?";
PreparedStatement prest = con.prepareStatement(sql);
prest.setString(1, textField_1.getText());
prest.setString(2, textField_2.getText());
prest.setString(3, textField_3.getText());
prest.setString(4, textField_4.getText());
prest.setString(5, textField_5.getText());
prest.setString(6, textArea.getText());
prest.setString(7, textField_6.getText());
prest.setString(8, textField_7.getText());
prest.setString(9, txtAUniqueStudent.getText());
prest.executeUpdate();
JOptionPane.showMessageDialog(frmModifyBooking, "Record has been updated.");
}
catch (SQLException e) {
//System.out.println("Record couldn't be added!");
e.printStackTrace();
JOptionPane.showMessageDialog(frmModifyBooking, "Record couldn't be updated. Please try again.");
}
}
}
});
button.setBounds(280, 402, 89, 23);
panel_1.add(button);
「有人能提醒嗎?」 - 建議什麼? – paislee 2012-03-12 18:01:12
什麼是textField_x變量?如果它們是TextField引用,則這些條件無效。 – Dan 2012-03-12 18:03:11