我没有得到 MVC
I dont get the MVC
package com.schinbehn.model;
import java.util.ArrayList;
public class CustomerReg {
private ArrayList<Customer> customerList;
public ArrayList<Customer> getCustomers() {
return customerList;
}
public void setCustomers(ArrayList<Customer> newCustomers) {
customerList = newCustomers;
}
public void addCustomer(Customer c) {
customerList.add(c);
}
public Customer findCustomer(String orgNummber) {
for (Customer tmp : customerList) {
if (orgNummber.equals(tmp.getOrgNumber())) {
return tmp;
}
}
return null;
}
}
您好，我很难掌握 MVC 设置。我正在做一个学校项目，我正在使用 swing/windowbuilder 创建 UI。现在的问题是，当我按下 jbutton "Spara" 时，我得到一个 nullpointerexception。这应该创建 class Customer 的新对象并获取文本框上的所有信息，然后将该对象添加到我在名为 CustomerReg 的 class 中的数组列表中。以及我的客户列表的名称。我还包括控制器 class。
控制器
package com.schinbehn.controller;
import com.schinbehn.model.Customer;
import com.schinbehn.model.CustomerReg;
public class Controller {
private CustomerReg customers;
private Customer customer;
public Controller() {
customers = new CustomerReg();
}
public Customer findCustomer(String orgNumber) {
return customers.findCustomer(orgNumber);
}
public void addCustomer(Customer k) {
customers.addCustomer(k);
}
}
查看
package com.schinbehn.view;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.CardLayout;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JTextField;
import com.schinbehn.model.Customer;
import com.schinbehn.controller.Controller;
import com.schinbehn.model.CustomerReg;
import com.schinbehn.model.Test;
import javax.swing.JTextArea;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JPasswordField;
import java.awt.Font;
import javax.swing.JSeparator;
import javax.swing.JToolBar;
import javax.swing.JTabbedPane;
import javax.swing.JInternalFrame;
import javax.swing.JProgressBar;
import org.eclipse.wb.swing.FocusTraversalOnArray;
import java.awt.Component;
import java.awt.Color;
public class ApplicationView {
private Controller controller;
private CustomerReg customerReg;
private Customer customer;
private JFrame frame;
private JButton btnCustomerButton;
private JPanel panelMenu;
private JPanel Customer;
private JPanel panelBuy;
private JTextField txtKundsOrgnummer;
private JTextField textFieldOrgNr;
private JTextField textFieldComanyName;
private JTextField textFieldBillingAdress;
private JTextField textFieldCompanyContact;
private JTextField textFieldEmail;
private JTextField textFieldPhoneNumber;
private JTextField textFieldAgreement;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ApplicationView window = new ApplicationView();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public ApplicationView() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 1024, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new CardLayout(0, 0));
JPanel panelMenu = new JPanel();
frame.getContentPane().add(panelMenu, "name_502949178913681");
panelMenu.setLayout(null);
panelMenu.setVisible(true);
JPanel panelCustomer = new JPanel();
frame.getContentPane().add(panelCustomer, "name_502951876763802");
panelCustomer.setLayout(null);
panelCustomer.setVisible(false);
JPanel panelBuy = new JPanel();
frame.getContentPane().add(panelBuy, "name_509394152157827");
panelBuy.setLayout(null);
JPanel panelNewCustomer = new JPanel();
frame.getContentPane().add(panelNewCustomer, "name_520111794431871");
panelNewCustomer.setLayout(null);
JLabel lblNewLabel = new JLabel("Org.Nummer:");
lblNewLabel.setBounds(54, 61, 78, 14);
panelNewCustomer.add(lblNewLabel);
JLabel lblFirmaNamn = new JLabel("Firmanamn:");
lblFirmaNamn.setBounds(54, 101, 78, 14);
panelNewCustomer.add(lblFirmaNamn);
JLabel lblFakturaadress = new JLabel("Fakturaadress:");
lblFakturaadress.setBounds(54, 142, 96, 14);
panelNewCustomer.add(lblFakturaadress);
JLabel lblKontaktperson = new JLabel("Kontaktperson:");
lblKontaktperson.setBounds(54, 192, 96, 14);
panelNewCustomer.add(lblKontaktperson);
JLabel lblNewLabel_1 = new JLabel("Emailadress:");
lblNewLabel_1.setBounds(54, 223, 78, 14);
panelNewCustomer.add(lblNewLabel_1);
JLabel lblTelnummer = new JLabel("Tel.Nummer:");
lblTelnummer.setBounds(54, 248, 78, 14);
panelNewCustomer.add(lblTelnummer);
JLabel lblAvtalMedKund = new JLabel("Avtal med kund:");
lblAvtalMedKund.setBounds(54, 357, 96, 14);
panelNewCustomer.add(lblAvtalMedKund);
textFieldOrgNr = new JTextField();
textFieldOrgNr.setBounds(142, 58, 138, 20);
panelNewCustomer.add(textFieldOrgNr);
textFieldOrgNr.setColumns(10);
textFieldComanyName = new JTextField();
textFieldComanyName.setBounds(142, 98, 138, 20);
panelNewCustomer.add(textFieldComanyName);
textFieldComanyName.setColumns(10);
textFieldBillingAdress = new JTextField();
textFieldBillingAdress.setBounds(142, 139, 138, 20);
panelNewCustomer.add(textFieldBillingAdress);
textFieldBillingAdress.setColumns(10);
textFieldCompanyContact = new JTextField();
textFieldCompanyContact.setBounds(142, 189, 138, 20);
panelNewCustomer.add(textFieldCompanyContact);
textFieldCompanyContact.setColumns(10);
textFieldEmail = new JTextField();
textFieldEmail.setBounds(142, 220, 138, 20);
panelNewCustomer.add(textFieldEmail);
textFieldEmail.setColumns(10);
textFieldPhoneNumber = new JTextField();
textFieldPhoneNumber.setBounds(142, 245, 138, 20);
panelNewCustomer.add(textFieldPhoneNumber);
textFieldPhoneNumber.setColumns(10);
textFieldAgreement = new JTextField();
textFieldAgreement.setBounds(142, 354, 279, 171);
panelNewCustomer.add(textFieldAgreement);
textFieldAgreement.setColumns(10);
JButton btnNewCustomerSpara = new JButton("Spara");
btnNewCustomerSpara.addActionListener(new ActionListener() {
@
Override
public void actionPerformed(ActionEvent e) {
Customer c = new Customer();
c.setOrgNumber(textFieldOrgNr.getText());
c.setCompanyName(textFieldComanyName.getText());
c.setBillingAdress(textFieldBillingAdress.getText());
c.setCompanyContact(textFieldCompanyContact.getText());
c.setEmail(textFieldEmail.getText());
c.setAgreement(textFieldAgreement.getText());
c.setPhoneNumber(textFieldPhoneNumber.getText());
**customerReg.addCustomer(c);**
}
});
btnNewCustomerSpara.setBounds(431, 461, 89, 23);
panelNewCustomer.add(btnNewCustomerSpara);
JButton btnNewCustomerBackButton = new JButton("Tillbaka");
btnNewCustomerBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelNewCustomer.setVisible(false);
panelCustomer.setVisible(true);
}
});
btnNewCustomerBackButton.setBounds(431, 502, 89, 23);
panelNewCustomer.add(btnNewCustomerBackButton);
JLabel lblSchinBehn_2 = new JLabel("Schin & Behn L\u00E4gg till ny kund");
lblSchinBehn_2.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_2.setBounds(10, 11, 301, 45);
panelNewCustomer.add(lblSchinBehn_2);
JPanel panelFindCustomer = new JPanel();
frame.getContentPane().add(panelFindCustomer, "name_520115016572819");
panelFindCustomer.setLayout(null);
JLabel lblSkKund = new JLabel("S\u00F6k kund");
lblSkKund.setBounds(20, 67, 66, 14);
panelFindCustomer.add(lblSkKund);
txtKundsOrgnummer = new JTextField();
txtKundsOrgnummer.setForeground(Color.GRAY);
txtKundsOrgnummer.setText("kunds orgnummer");
txtKundsOrgnummer.setBounds(83, 64, 194, 20);
panelFindCustomer.add(txtKundsOrgnummer);
txtKundsOrgnummer.setColumns(10);
JButton btnFindKundFindButton = new JButton("S\u00F6k");
btnFindKundFindButton.setBounds(287, 63, 89, 23);
panelFindCustomer.add(btnFindKundFindButton);
JLabel lblSchinBehn_3 = new JLabel("Schin & Behn S\u00F6k kund");
lblSchinBehn_3.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_3.setBounds(10, 11, 301, 45);
panelFindCustomer.add(lblSchinBehn_3);
JButton btnFindCustomerBackButton = new JButton("Tillbaka");
btnFindCustomerBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelFindCustomer.setVisible(false);
panelCustomer.setVisible(true);
}
});
btnFindCustomerBackButton.setBounds(422, 489, 89, 23);
panelFindCustomer.add(btnFindCustomerBackButton);
JButton btnBuyBackButton = new JButton("Tillbaka");
btnBuyBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelBuy.setVisible(false);
panelMenu.setVisible(true);
}
});
btnBuyBackButton.setBounds(909, 502, 89, 23);
panelBuy.add(btnBuyBackButton);
JLabel lblVlkommenTillSchin = new JLabel("V\u00E4lkommen till Schin & Behn");
lblVlkommenTillSchin.setFont(new Font("Tahoma", Font.PLAIN, 42));
lblVlkommenTillSchin.setBounds(223, 11, 550, 78);
panelMenu.add(lblVlkommenTillSchin);
JLabel lblSchinBehn = new JLabel("Schin & Behn Webbshop");
lblSchinBehn.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn.setBounds(10, 11, 195, 45);
panelBuy.add(lblSchinBehn);
panelBuy.setVisible(false);
JLabel lblSchinBehn_1 = new JLabel("Schin & Behn Kundhantering");
lblSchinBehn_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_1.setBounds(10, 11, 213, 45);
panelCustomer.add(lblSchinBehn_1);
JButton btnNewCustomerButton = new JButton("Lägg till ny kund");
btnNewCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(false);
panelNewCustomer.setVisible(true);
}
});
btnNewCustomerButton.setBounds(57, 88, 130, 38);
panelCustomer.add(btnNewCustomerButton);
JButton btnFindCustomerButton = new JButton("Sök kund");
btnFindCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(false);
panelFindCustomer.setVisible(true);
}
});
btnFindCustomerButton.setBounds(214, 88, 137, 38);
panelCustomer.add(btnFindCustomerButton);
panelCustomer.setFocusTraversalPolicy(new FocusTraversalOnArray(
new Component[] {
lblSchinBehn_1, btnNewCustomerButton, btnFindCustomerButton
}));
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
btnCustomerButton = new JButton("Kundhanteing");
menuBar.add(btnCustomerButton);
JButton btnBuyButton = new JButton("Köp");
menuBar.add(btnBuyButton);
btnBuyButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelBuy.setVisible(true);
panelMenu.setVisible(false);
panelCustomer.setVisible(false);
}
});
btnCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(true);
panelMenu.setVisible(false);
panelBuy.setVisible(false);
}
});
}
public JButton getBtnCustomerButton() {
return btnCustomerButton;
}
}
NPE 的原因是您的 customerReg 从未在 ApplicationView class:
中创建
在ApplicationView的成员部分写下：
private CustomerReg customerReg = new CustomerReg();
或更好。让控制器完成这项工作。但是 controller 也必须创建（在您的代码中不是这种情况）：
private Controller controller = new Controller();
@Override
public void actionPerformed(ActionEvent e) {
Customer c = new Customer();
c.setOrgNumber(textFieldOrgNr.getText());
c.setCompanyName(textFieldComanyName.getText());
c.setBillingAdress(textFieldBillingAdress.getText());
c.setCompanyContact(textFieldCompanyContact.getText());
c.setEmail(textFieldEmail.getText());
c.setAgreement(textFieldAgreement.getText());
c.setPhoneNumber(textFieldPhoneNumber.getText());
controller.addCustomer(c);
}
});
package com.schinbehn.model;
import java.util.ArrayList;
public class CustomerReg {
private ArrayList<Customer> customerList;
public ArrayList<Customer> getCustomers() {
return customerList;
}
public void setCustomers(ArrayList<Customer> newCustomers) {
customerList = newCustomers;
}
public void addCustomer(Customer c) {
customerList.add(c);
}
public Customer findCustomer(String orgNummber) {
for (Customer tmp : customerList) {
if (orgNummber.equals(tmp.getOrgNumber())) {
return tmp;
}
}
return null;
}
}
您好，我很难掌握 MVC 设置。我正在做一个学校项目，我正在使用 swing/windowbuilder 创建 UI。现在的问题是，当我按下 jbutton "Spara" 时，我得到一个 nullpointerexception。这应该创建 class Customer 的新对象并获取文本框上的所有信息，然后将该对象添加到我在名为 CustomerReg 的 class 中的数组列表中。以及我的客户列表的名称。我还包括控制器 class。
控制器
package com.schinbehn.controller;
import com.schinbehn.model.Customer;
import com.schinbehn.model.CustomerReg;
public class Controller {
private CustomerReg customers;
private Customer customer;
public Controller() {
customers = new CustomerReg();
}
public Customer findCustomer(String orgNumber) {
return customers.findCustomer(orgNumber);
}
public void addCustomer(Customer k) {
customers.addCustomer(k);
}
}
查看
package com.schinbehn.view;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.CardLayout;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JTextField;
import com.schinbehn.model.Customer;
import com.schinbehn.controller.Controller;
import com.schinbehn.model.CustomerReg;
import com.schinbehn.model.Test;
import javax.swing.JTextArea;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JPasswordField;
import java.awt.Font;
import javax.swing.JSeparator;
import javax.swing.JToolBar;
import javax.swing.JTabbedPane;
import javax.swing.JInternalFrame;
import javax.swing.JProgressBar;
import org.eclipse.wb.swing.FocusTraversalOnArray;
import java.awt.Component;
import java.awt.Color;
public class ApplicationView {
private Controller controller;
private CustomerReg customerReg;
private Customer customer;
private JFrame frame;
private JButton btnCustomerButton;
private JPanel panelMenu;
private JPanel Customer;
private JPanel panelBuy;
private JTextField txtKundsOrgnummer;
private JTextField textFieldOrgNr;
private JTextField textFieldComanyName;
private JTextField textFieldBillingAdress;
private JTextField textFieldCompanyContact;
private JTextField textFieldEmail;
private JTextField textFieldPhoneNumber;
private JTextField textFieldAgreement;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ApplicationView window = new ApplicationView();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public ApplicationView() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 1024, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new CardLayout(0, 0));
JPanel panelMenu = new JPanel();
frame.getContentPane().add(panelMenu, "name_502949178913681");
panelMenu.setLayout(null);
panelMenu.setVisible(true);
JPanel panelCustomer = new JPanel();
frame.getContentPane().add(panelCustomer, "name_502951876763802");
panelCustomer.setLayout(null);
panelCustomer.setVisible(false);
JPanel panelBuy = new JPanel();
frame.getContentPane().add(panelBuy, "name_509394152157827");
panelBuy.setLayout(null);
JPanel panelNewCustomer = new JPanel();
frame.getContentPane().add(panelNewCustomer, "name_520111794431871");
panelNewCustomer.setLayout(null);
JLabel lblNewLabel = new JLabel("Org.Nummer:");
lblNewLabel.setBounds(54, 61, 78, 14);
panelNewCustomer.add(lblNewLabel);
JLabel lblFirmaNamn = new JLabel("Firmanamn:");
lblFirmaNamn.setBounds(54, 101, 78, 14);
panelNewCustomer.add(lblFirmaNamn);
JLabel lblFakturaadress = new JLabel("Fakturaadress:");
lblFakturaadress.setBounds(54, 142, 96, 14);
panelNewCustomer.add(lblFakturaadress);
JLabel lblKontaktperson = new JLabel("Kontaktperson:");
lblKontaktperson.setBounds(54, 192, 96, 14);
panelNewCustomer.add(lblKontaktperson);
JLabel lblNewLabel_1 = new JLabel("Emailadress:");
lblNewLabel_1.setBounds(54, 223, 78, 14);
panelNewCustomer.add(lblNewLabel_1);
JLabel lblTelnummer = new JLabel("Tel.Nummer:");
lblTelnummer.setBounds(54, 248, 78, 14);
panelNewCustomer.add(lblTelnummer);
JLabel lblAvtalMedKund = new JLabel("Avtal med kund:");
lblAvtalMedKund.setBounds(54, 357, 96, 14);
panelNewCustomer.add(lblAvtalMedKund);
textFieldOrgNr = new JTextField();
textFieldOrgNr.setBounds(142, 58, 138, 20);
panelNewCustomer.add(textFieldOrgNr);
textFieldOrgNr.setColumns(10);
textFieldComanyName = new JTextField();
textFieldComanyName.setBounds(142, 98, 138, 20);
panelNewCustomer.add(textFieldComanyName);
textFieldComanyName.setColumns(10);
textFieldBillingAdress = new JTextField();
textFieldBillingAdress.setBounds(142, 139, 138, 20);
panelNewCustomer.add(textFieldBillingAdress);
textFieldBillingAdress.setColumns(10);
textFieldCompanyContact = new JTextField();
textFieldCompanyContact.setBounds(142, 189, 138, 20);
panelNewCustomer.add(textFieldCompanyContact);
textFieldCompanyContact.setColumns(10);
textFieldEmail = new JTextField();
textFieldEmail.setBounds(142, 220, 138, 20);
panelNewCustomer.add(textFieldEmail);
textFieldEmail.setColumns(10);
textFieldPhoneNumber = new JTextField();
textFieldPhoneNumber.setBounds(142, 245, 138, 20);
panelNewCustomer.add(textFieldPhoneNumber);
textFieldPhoneNumber.setColumns(10);
textFieldAgreement = new JTextField();
textFieldAgreement.setBounds(142, 354, 279, 171);
panelNewCustomer.add(textFieldAgreement);
textFieldAgreement.setColumns(10);
JButton btnNewCustomerSpara = new JButton("Spara");
btnNewCustomerSpara.addActionListener(new ActionListener() {
@
Override
public void actionPerformed(ActionEvent e) {
Customer c = new Customer();
c.setOrgNumber(textFieldOrgNr.getText());
c.setCompanyName(textFieldComanyName.getText());
c.setBillingAdress(textFieldBillingAdress.getText());
c.setCompanyContact(textFieldCompanyContact.getText());
c.setEmail(textFieldEmail.getText());
c.setAgreement(textFieldAgreement.getText());
c.setPhoneNumber(textFieldPhoneNumber.getText());
**customerReg.addCustomer(c);**
}
});
btnNewCustomerSpara.setBounds(431, 461, 89, 23);
panelNewCustomer.add(btnNewCustomerSpara);
JButton btnNewCustomerBackButton = new JButton("Tillbaka");
btnNewCustomerBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelNewCustomer.setVisible(false);
panelCustomer.setVisible(true);
}
});
btnNewCustomerBackButton.setBounds(431, 502, 89, 23);
panelNewCustomer.add(btnNewCustomerBackButton);
JLabel lblSchinBehn_2 = new JLabel("Schin & Behn L\u00E4gg till ny kund");
lblSchinBehn_2.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_2.setBounds(10, 11, 301, 45);
panelNewCustomer.add(lblSchinBehn_2);
JPanel panelFindCustomer = new JPanel();
frame.getContentPane().add(panelFindCustomer, "name_520115016572819");
panelFindCustomer.setLayout(null);
JLabel lblSkKund = new JLabel("S\u00F6k kund");
lblSkKund.setBounds(20, 67, 66, 14);
panelFindCustomer.add(lblSkKund);
txtKundsOrgnummer = new JTextField();
txtKundsOrgnummer.setForeground(Color.GRAY);
txtKundsOrgnummer.setText("kunds orgnummer");
txtKundsOrgnummer.setBounds(83, 64, 194, 20);
panelFindCustomer.add(txtKundsOrgnummer);
txtKundsOrgnummer.setColumns(10);
JButton btnFindKundFindButton = new JButton("S\u00F6k");
btnFindKundFindButton.setBounds(287, 63, 89, 23);
panelFindCustomer.add(btnFindKundFindButton);
JLabel lblSchinBehn_3 = new JLabel("Schin & Behn S\u00F6k kund");
lblSchinBehn_3.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_3.setBounds(10, 11, 301, 45);
panelFindCustomer.add(lblSchinBehn_3);
JButton btnFindCustomerBackButton = new JButton("Tillbaka");
btnFindCustomerBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelFindCustomer.setVisible(false);
panelCustomer.setVisible(true);
}
});
btnFindCustomerBackButton.setBounds(422, 489, 89, 23);
panelFindCustomer.add(btnFindCustomerBackButton);
JButton btnBuyBackButton = new JButton("Tillbaka");
btnBuyBackButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelBuy.setVisible(false);
panelMenu.setVisible(true);
}
});
btnBuyBackButton.setBounds(909, 502, 89, 23);
panelBuy.add(btnBuyBackButton);
JLabel lblVlkommenTillSchin = new JLabel("V\u00E4lkommen till Schin & Behn");
lblVlkommenTillSchin.setFont(new Font("Tahoma", Font.PLAIN, 42));
lblVlkommenTillSchin.setBounds(223, 11, 550, 78);
panelMenu.add(lblVlkommenTillSchin);
JLabel lblSchinBehn = new JLabel("Schin & Behn Webbshop");
lblSchinBehn.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn.setBounds(10, 11, 195, 45);
panelBuy.add(lblSchinBehn);
panelBuy.setVisible(false);
JLabel lblSchinBehn_1 = new JLabel("Schin & Behn Kundhantering");
lblSchinBehn_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
lblSchinBehn_1.setBounds(10, 11, 213, 45);
panelCustomer.add(lblSchinBehn_1);
JButton btnNewCustomerButton = new JButton("Lägg till ny kund");
btnNewCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(false);
panelNewCustomer.setVisible(true);
}
});
btnNewCustomerButton.setBounds(57, 88, 130, 38);
panelCustomer.add(btnNewCustomerButton);
JButton btnFindCustomerButton = new JButton("Sök kund");
btnFindCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(false);
panelFindCustomer.setVisible(true);
}
});
btnFindCustomerButton.setBounds(214, 88, 137, 38);
panelCustomer.add(btnFindCustomerButton);
panelCustomer.setFocusTraversalPolicy(new FocusTraversalOnArray(
new Component[] {
lblSchinBehn_1, btnNewCustomerButton, btnFindCustomerButton
}));
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
btnCustomerButton = new JButton("Kundhanteing");
menuBar.add(btnCustomerButton);
JButton btnBuyButton = new JButton("Köp");
menuBar.add(btnBuyButton);
btnBuyButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelBuy.setVisible(true);
panelMenu.setVisible(false);
panelCustomer.setVisible(false);
}
});
btnCustomerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
panelCustomer.setVisible(true);
panelMenu.setVisible(false);
panelBuy.setVisible(false);
}
});
}
public JButton getBtnCustomerButton() {
return btnCustomerButton;
}
}
NPE 的原因是您的 customerReg 从未在 ApplicationView class:
在ApplicationView的成员部分写下：
private CustomerReg customerReg = new CustomerReg();
或更好。让控制器完成这项工作。但是 controller 也必须创建（在您的代码中不是这种情况）：
private Controller controller = new Controller();
@Override
public void actionPerformed(ActionEvent e) {
Customer c = new Customer();
c.setOrgNumber(textFieldOrgNr.getText());
c.setCompanyName(textFieldComanyName.getText());
c.setBillingAdress(textFieldBillingAdress.getText());
c.setCompanyContact(textFieldCompanyContact.getText());
c.setEmail(textFieldEmail.getText());
c.setAgreement(textFieldAgreement.getText());
c.setPhoneNumber(textFieldPhoneNumber.getText());
controller.addCustomer(c);
}
});