我在向jtable添加数据时遇到了困难。它首先加载来自集合的数据，用jtextfield我添加一个新数据，当然数据被添加到集合调试它但我无法在我的jtable中显示新添加的日期。我已经尝试了所有可能的方法，但无法做到。下面的代码是我工作的一部分。
由于
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package com.example.gui;
import com.example.service.CustomerService;
import com.example.service.VehicleService;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
/**
*
* @author Tugrul
*/
public class VehicleTypes extends JFrame {
private JLabel lblVehicleType;
private JTextField txtVehicleType;
private JButton btnCreateVehicleType;
private JButton btnClearField;
private JTable jtDataTable;
private JPanel formPanel;
private JPanel dataPanel;
private JPanel buttonPanel;
private JMenu jmFile;
private JMenu jmCustomer;
private JMenu jmServiceDesk;
private JMenuBar appMenuBar;
private JMenuItem jmiMainMenu;
private JMenuItem jmiExit;
private JMenuItem jmiPlaceBooking;
private JMenuItem jmiRegister;
private JMenuItem jmiVehicleTypes;
private JMenuItem jmiCustomerType;
private JMenuItem jmiVehicles;
private JMenuItem jmiCustomers;
private JMenuItem jmiManageBookings;
private CustomDataTable customDataTable;
public VehicleTypes() {
drawForm();
}
public void drawForm() {
customDataTable = new CustomDataTable();
jtDataTable = new JTable(customDataTable);
/*Drawing root menu*/
jmFile = new JMenu("File");
jmCustomer = new JMenu("Customer");
jmServiceDesk = new JMenu("Service Desk");
appMenuBar = new JMenuBar();
/*Drawing File Menu*/
jmiMainMenu = new JMenuItem("Main Menu");
jmiExit = new JMenuItem("Exit");
jmFile.add(jmiMainMenu);
jmFile.add(jmiExit);
/*Drawing Customer Menu*/
jmiPlaceBooking = new JMenuItem("Place Booking");
jmiRegister = new JMenuItem("Register");
jmCustomer.add(jmiPlaceBooking);
jmCustomer.add(jmiRegister);
/*Drawing Service Desk Menu*/
jmiVehicleTypes = new JMenuItem("Vehicle Types");
jmiCustomerType = new JMenuItem("Customer Types");
jmiVehicles = new JMenuItem("Vehicles");
jmiCustomers = new JMenuItem("Customers");
jmiManageBookings = new JMenuItem("Manage Bookings");
jmServiceDesk.add(jmiVehicleTypes);
jmServiceDesk.add(jmiCustomerType);
jmServiceDesk.add(jmiVehicles);
jmServiceDesk.add(jmiCustomers);
jmServiceDesk.add(jmiManageBookings);
/*Add menus to menubar*/
appMenuBar.add(jmFile);
appMenuBar.add(jmCustomer);
appMenuBar.add(jmServiceDesk);
/*Adding listeners for each element*/
jmiMainMenu.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiPlaceBooking.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiRegister.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiVehicleTypes.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiCustomerType.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiVehicles.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiCustomers.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
jmiManageBookings.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
lblVehicleType = new JLabel("Vehicle Type");
txtVehicleType = new JTextField();
btnCreateVehicleType = new JButton("Create");
btnClearField = new JButton("Clear Fields");
formPanel = new JPanel();
dataPanel = new JPanel();
buttonPanel = new JPanel();
setSize(800, 600);
setTitle("Vehicle Types");
setDefaultCloseOperation(EXIT_ON_CLOSE);
//Centering the application on screen
Toolkit toolkit = getToolkit();
Dimension size = toolkit.getScreenSize();
setLocation(size.width / 2 - getWidth() / 2,
size.height / 2 - getHeight() / 2);
formPanel.add(lblVehicleType);
formPanel.add(txtVehicleType);
dataPanel.add(new JScrollPane(jtDataTable));
buttonPanel.add(btnCreateVehicleType);
buttonPanel.add(btnClearField);
/*Setting layouts for panels*/
formPanel.setLayout(new GridLayout(1, 1, 0, 0));
dataPanel.setLayout(new GridLayout(1, 2, 10, 10));
buttonPanel.setLayout(new GridLayout(2, 1, 5, 5));
/*Adding panels to main jframe*/
add(dataPanel, BorderLayout.NORTH);
add(formPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);
setJMenuBar(appMenuBar);
//Adding buttons to listeners
btnCreateVehicleType.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
btnClearField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
formListener(e);
}
});
}
private class CustomDataTable extends AbstractTableModel {
private VehicleService vehicleService = new VehicleService();
int rowCount = vehicleService.retrieveVehicleTypes().size();
private String[] columnNames = {"Vehicle Type"};
@Override
public String getColumnName(int col) {
return columnNames[col];
}
@Override
public int getRowCount() {
return rowCount;
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object val = (Object) vehicleService.retrieveVehicleTypes().get(rowIndex);
return val;
}
public void insertData(String values) {
vehicleService.createVehicleType(values);
fireTableDataChanged();
System.out.println("affected data" + vehicleService.retrieveVehicleTypes().toString());
}
}
public void clearFields() {
txtVehicleType.setText("");
}
public void formListener(ActionEvent e) {
VehicleService vehicleService = new VehicleService();
String clickedItem = e.getActionCommand();
String vehicleType = txtVehicleType.getText().toString();
if (clickedItem.equals("Create")) {
if (vehicleService.checkVehicleTypeAvailability(vehicleType)) {
JOptionPane.showMessageDialog(null, vehicleType + " Vehicle type already exists in Database",
"Vehicle Warning",
JOptionPane.WARNING_MESSAGE);
} else {
customDataTable.insertData(vehicleType);
this.invalidate();
this.validate();
this.repaint();
this.revalidate();
jtDataTable.revalidate();
jtDataTable.repaint();
}
}
if (clickedItem.equals("Clear Fields")) {
//clear field code
clearFields();
}
//Jmenu listener
if (clickedItem.equals("Main Menu")) {
VehicleTypes customerTypes = new VehicleTypes();
CustomerManagement customerManagement = new CustomerManagement();
customerTypes.setVisible(false);
customerManagement.setVisible(true);
}
if (clickedItem.equals("Exit")) {
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(null, "Are you sure to leave the application", "Confim Process", dialogButton);
if (dialogResult == 0) {
System.exit(1);
}
}
if (clickedItem.equals("Place Booking")) {
}
if (clickedItem.equals("Register")) {
}
if (clickedItem.equals("Vehicle Types")) {
//dont do anything
}
if (clickedItem.equals("Customer Types")) {
CustomerTypes customerTypes = new CustomerTypes();
this.setVisible(false);
customerTypes.setVisible(true);
}
if (clickedItem.equals("Vehicles")) {
}
if (clickedItem.equals("Customers")) {
}
if (clickedItem.equals("Manage Bookings")) {
}
}//Action listener end curly brace
public static void main(String[] args) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
System.out.println("Exception Caught " + ex);
} catch (InstantiationException ex) {
System.out.println("Exception Caught " + ex);
} catch (IllegalAccessException ex) {
System.out.println("Exception Caught " + ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
System.out.println("Exception Caught " + ex);
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new VehicleTypes().setVisible(true);
}
});
}
}
答案 0 :(得分：1)
这种方法实施得不好：
public void insertData(String values) {
vehicleService.createVehicleType(values);
fireTableDataChanged(); // No, call fireTableRowsInserted(...) instead
...
}
此时调用fireTableDateChanged()是过分且不必要的，因为您似乎在表中添加了一行。正确的实现应该按如下方式调用fireTableRowsInserted(int firstRow, int lastRow)：
public void insertData(String values) {
vehicleService.createVehicleType(values);
int lastIndex = vehicleService.retrieveVehicleTypes().size() - 1;
fireTableRowsInserted(lastIndex, lastIndex); // first and last indices are the same
}
此外，在向表模型添加新行之后，不需要revalidate()或repaint()。只需通知听众就足够了：JTable是自己模型的监听者，并会在TableModelEvents上相应地重新绘制自己。