Java 使用GET时在netbeans中引发异常
我试图通过GET将数据从模型类检索到textfield中,尽管nullpointexception抛出了一个错误 视图类中的代码为=Java 使用GET时在netbeans中引发异常,java,swing,exception,netbeans,Java,Swing,Exception,Netbeans,我试图通过GET将数据从模型类检索到textfield中,尽管nullpointexception抛出了一个错误 视图类中的代码为= public View_EditCustomer(Model_Customer cust) { customer = cust; txtname.setText(customer.GetFName()); txtSecondName.setText(customer.GetLName()); i
public View_EditCustomer(Model_Customer cust) {
customer = cust;
txtname.setText(customer.GetFName());
txtSecondName.setText(customer.GetLName());
initComponents();
}
在另一个视图类中,它是=
private void btnSelectActionPerformed(java.awt.event.ActionEvent evt) {
ListSelectionModel rowSM = jTable1.getSelectionModel();
int row = rowSM.getMinSelectionIndex();
int Appointment_ID = (Integer)resultModel.getValueAt(row, 0);
Model_Customer cust = null;
try{
cust = Controller_ManageCustomer.GetCustomer(Appointment_ID);
new View_EditCustomer(cust).setVisible(true);
}catch(Exception ex){
JOptionPane.showMessageDialog(this,ex.getMessage(),"Error",JOptionPane.ERROR_MESSAGE);
}
}
型号\客户代码部件=
public static Model_Customer QueryID(int Appointment_ID) throws Exception
{
try{
Statement stmt = Model_Customer.conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM appointment WHERE appointmentid="+Appointment_ID+" LIMIT 1;");
if(rs.next())
return new Model_Customer(rs.getInt(1),rs.getString(2),rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9),rs.getString(10),rs.getString(11),rs.getString(12));
}catch(Exception e){
throw new Exception(e.getMessage());
}
return null;
}
private Model_Customer(int Appointment_ID, String FName, String LName, String Registration, String Make, String Model, String Engine, String Year, String Mileage, String Type, String Date, String Time)
{
this._Appointment_ID=Appointment_ID;
this._Type=Type;
this._Time=Time;
this._Date=Date;
this._FName=FName;
this._LName=LName;
this._Make=Make;
this._Model=Model;
this._Engine=Engine;
this._Year=Year;
this._Mileage=Mileage;
this._Registration=Registration;
this._inSync=true;
}
public int GetID()
{
return this._Appointment_ID;
}
public String GetFName()
{
return _FName;
}
public String GetLName()
{
return _LName;
}
public String GetRegistration()
{
return _Registration;
}
public String GetMake()
{
return _Make;
}
public String GetModel()
{
return _Model;
}
public String GetEngine()
{
return _Engine;
}
public String GetYear()
{
return _Year;
}
public String GetMileage()
{
return _Mileage;
}
public String GetType()
{
return _Type;
}
public String GetDate()
{
return _Date;
}
public String GetTime()
{
return _Time;
}
在调试模型_中,Customer cust实际上由数据填充,它实际上位于txtname.setText(Customer.GetFName())的末尾;转到Model_Customer GetFName并应检索名称,但引发异常(int)0。非常感谢你的帮助 不应该初始化组件();是否在使用文本视图之前调用
public View_EditCustomer(Model_Customer cust) {
initComponents();
customer = cust;
txtname.setText(customer.GetFName());
txtSecondName.setText(customer.GetLName());
}
请粘贴例外,以便查看详细信息。并发布模型类客户。您知道
NUllPointerException
的含义吗。如果你这样做了,只要看看它指向的那条线,找出为什么那条线会产生一个空值,试着把你的initComponents
放在其他三行之前。该死的。。。我确信在英国编写代码已经太晚了:D你是100%正确的!谢谢