Question

我正在处理我的项目，但我不知道如何解决此异常。

当我的用户没有信用卡号时，我可以毫无问题地添加一个和钱。但是，当我再次登录并要添加钱时，必须在TextField（numberOfCreditCardTF）中输入他的信用卡号，然后按“添加”按钮。当我按下此按钮时，在控制台中会出现异常。

存在此问题的行位于220：

String querryUpdateMoney = "UPDATE
     money SET moneyCard=" +
     Long.parseLong(cg.moneyOnCreditCardTF.getText().trim()) + " WHERE
     numberCard=" +
     Long.parseLong(cg.numberOfCreditCardTF.getText().trim());

这是我的代码：

cg.addMoneyBtn.addActionListener(e1 -> {

                        String query = "SELECT * FROM user WHERE username = '" + cg.ulogovanikorisnik.getText() + "'";
                        ResultSet result = null;
                        try {
                            result = sqlConnector.select(query);
                        } catch (SQLException ex) {
                            ex.printStackTrace();
                        }
                        try {
                            if (result.next()) {
                                Long numberCard= Long.valueOf(cg.numberOfCreditCardTF.getText());
                                String upit = "SELECT * FROM money WHERE numberCard="+numberCard;
                                ResultSet resultSet = null;

                                try {
                                    resultSet = sqlConnector.select(upit);
                                    System.out.println(upit);
                                } catch (SQLException ex) {
                                    ex.printStackTrace();
                                }
                                try {

                                    if (!resultSet.next()) {
                                        String query2 = "INSERT INTO money (idUlogovani,numberCard,moneyCard)" +
                                                " VALUES(" + result.getLong("id") + "," + Long.parseLong(cg.numberOfCreditCardTF.getText()) + "," + 0 + ")";

                                        int rs = sqlConnector.iudQuerry(query2);
                                        infoMessage("Number of credit card is correct", "Credit Card INFO");
                                        cg.moneyOnCreditCardTF.setVisible(true);
                                        cg.moneyOnCreditCardLbl.setVisible(true);
                                        cg.numberOfCreditCardTF.setEditable(false);
                                        cg.addMoneyBtn.setText("Input money");
                                        cg.addMoneyBtn.setBounds(350, 280, 283, 36);

                                    } else {
                                        String querryUpdateMoney = "UPDATE money SET moneyCard=" + Long.parseLong(cg.moneyOnCreditCardTF.getText().trim()) + " WHERE numberCard=" + Long.parseLong(cg.numberOfCreditCardTF.getText().trim());
                                        int rsUpdate = sqlConnector.iudQuerry(querryUpdateMoney);
                                        System.out.println("ok sve");
                                    }
                                } catch (NumberFormatException ex) {
                                    ex.printStackTrace();
                                } catch (SQLException ex) {
                                    ex.printStackTrace();
                                }
                            }
                        } catch (NumberFormatException ex) {
                            ex.printStackTrace();
                        } catch (SQLException ex) {
                            ex.printStackTrace();
                        }
                    });
                });

这是个例外：

java.lang.NumberFormatException：对于输入字符串：“” 在java.base / java.lang.NumberFormatException.forInputString（NumberFormatException.java:68）在java.base / java.lang.Long.parseLong（Long.java:709）在java.base / java.lang.Long.parseLong（Long.java:824）在Graphics.lambda $ main $ 1（Graphics.java:220）在java.desktop / javax.swing.AbstractButton.fireActionPerformed（AbstractButton.java:1967）在java.desktop / javax.swing.AbstractButton $ Handler.actionPerformed（AbstractButton.java:2308）在java.desktop / javax.swing.DefaultButtonModel.fireActionPerformed（DefaultButtonModel.java:405）在java.desktop / javax.swing.DefaultButtonModel.setPressed（DefaultButtonModel.java:262）在java.desktop / javax.swing.plaf.basic.BasicButtonListener.mouseReleased（BasicButtonListener.java:279）在java.desktop / java.awt.Component.processMouseEvent（Component.java:6632）在java.desktop / javax.swing.JComponent.processMouseEvent（JComponent.java:3342）在java.desktop / java.awt.Component.processEvent（Component.java:6397）在java.desktop / java.awt.Container.processEvent（Container.java:2263）在java.desktop / java.awt.Component.dispatchEventImpl（Component.java:5008）在java.desktop / java.awt.Container.dispatchEventImpl（Container.java:2321）在java.desktop / java.awt.Component.dispatchEvent（Component.java:4840）在java.desktop / java.awt.LightweightDispatcher.retargetMouseEvent（Container.java:4918）在java.desktop / java.awt.LightweightDispatcher.processMouseEvent（Container.java:4547）在java.desktop / java.awt.LightweightDispatcher.dispatchEvent（Container.java:4488）在java.desktop / java.awt.Container.dispatchEventImpl（Container.java:2307）在java.desktop / java.awt.Window.dispatchEventImpl（Window.java:2762）在java.desktop / java.awt.Component.dispatchEvent（Component.java:4840）在java.desktop / java.awt.EventQueue.dispatchEventImpl（EventQueue.java:772）在java.desktop / java.awt.EventQueue $ 4.run（EventQueue.java:721）在java.desktop / java.awt.EventQueue $ 4.run（EventQueue.java:715）在java.base / java.security.AccessController.doPrivileged（AccessController.java:389）在java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:85）在java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:95）在java.desktop / java.awt.EventQueue $ 5.run（EventQueue.java:745）在java.desktop / java.awt.EventQueue $ 5.run（EventQueue.java:743）在java.base / java.security.AccessController.doPrivileged（AccessController.java:389）在java.base / java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege（ProtectionDomain.java:85）在java.desktop / java.awt.EventQueue.dispatchEvent（EventQueue.java:742）在java.desktop / java.awt.EventDispatchThread.pumpOneEventForFilters（EventDispatchThread.java:203）在java.desktop / java.awt.EventDispatchThread.pumpEventsForFilter（EventDispatchThread.java:124）在java.desktop / java.awt.EventDispatchThread.pumpEventsForHierarchy（EventDispatchThread.java:113）在java.desktop / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:109）在java.desktop / java.awt.EventDispatchThread.pumpEvents（EventDispatchThread.java:101）在java.desktop / java.awt.EventDispatchThread.run（EventDispatchThread.java:90）

如何修复“对于输入字符串”“”

0 个答案: