JTable not displaying column headers
This is my first experience with a GUI, so I'm not entirely sure what is causing the problem. I have an assignment from my Uni. The project should make a kind of "Product Management" program for various purposes. All of this is done except for the GUI and this is where I just don't understand why this JTable
one won't display the column headers. Here's the code (btw using MIGLayout)
package sepm.s2012.e0727422.gui;
import sepm.s2012.e0727422.service.*;
import java.awt.*;
import javax.swing.*;
import net.miginfocom.swing.MigLayout;
public class MainFrame {
/** Start all services **/
// IProductService ps = new ProductService();
// IInvoiceService is = new InvoiceService();
// IOrderService os = new OrderService();
/** Frame **/
private JFrame frame;
private JTabbedPane tab;
public static void main(String[] args) {
new MainFrame();
}
public MainFrame() {
frame = new JFrame("Product control and management system");
frame.setVisible(true);
frame.setSize(800, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
/** TABBED PANE options and parameters **/
tab = new JTabbedPane();
ImageIcon icon = null; // TODO
tab.addTab("Products", icon, tabProducts(), "Add/Update/Delete products");
tab.addTab("Invoices", icon, tabInvoices(), "Overview of invoices");
tab.addTab("Cart", icon, tabCart(), "Order new products");
tab.setSelectedIndex(0);
frame.add(tab, BorderLayout.CENTER);
}
/**
* Products Panel tab
* @return panel
*/
public JPanel tabProducts() {
JPanel panel = new JPanel(new MigLayout("","20 [] 20", "10 [] 10 [] 10 [] 10"));
JLabel label = new JLabel("List of all available products");
JButton add = new JButton("Add product");
JButton update = new JButton("Update product");
// Below is a test table, will be replace by products in DB
String[] tableTitle = new String[] {"ID", "Name", "Type", "Price", "In stock"};
String[][] tableData = new String[][] {{"1", "Item 1", "Type 1", "0.00", "0"}, {"2", "Item 2", "Type 2", "0.00", "0"},
{"3", "Item 3", "Type 3", "0.00", "0"}, {"4", "Item 4", "Type 4", "0.00", "0"}};
JTable table = new JTable(tableData, tableTitle);
panel.add(label, "wrap, span");
panel.add(table, "wrap, span");
panel.add(add);
panel.add(update);
return panel;
}
public JPanel tabInvoices() {
JPanel panel = new JPanel(new MigLayout());
return panel;
}
public JPanel tabCart() {
JPanel panel = new JPanel(new MigLayout());
return panel;
}
}
source to share
First add the table to the JScrollPane:
JScrollPane scrollpane = new JScrollPane(table);
then add scroll to layout:
panel.add(scrollpane, "wrap, span");
Second, add all the components to the frame and make them visible at the end of your method:
//...
frame.add(tab, BorderLayout.CENTER);
frame.validate();
frame.setVisible(true);
source to share
Add the table to JScrollPane
Docs for JTable
state:
.. Note that if you want to use
JTable
offline (out ofJScrollPane
) view and want the displayed title to appear, you can retrieve it withgetTableHeader()
and display it separately.
source to share
For miglayout, I use this:
JPanel panel = new JPanel(new MigLayout("wrap 1, gapy 0"));
table = CreateParametersTable();
panel.add(table.getTableHeader(), "width 100%");
panel.add(table, "width 100%");
For removing vertical gaps read this How to remove vertical gap between two cells in MigLayout?
source to share