For some reason my JTable is not displaying it's column names?! I'm certain I've done everything correctly. I've literally copied this from a demonstration so I don't understand why it won't work.
Here is my code:
public class MemTableModel extends AbstractTableModel{
private ArrayList<member> members = new ArrayList<member>();
private String[] columnNames = {"ID", "Name", "Email", "Country", "Genre",
"Gender", "Description", "Type", "Limit", "Card No", "Expiry Date"};
public MemTableModel(){
LoadTableFromDB();
}
public int getRowCount(){
return members.size();
}
public int getColumnCount(){
return columnNames.length;
}
public Object getValueAt(int row, int col){
//Get the row from the about get method
member f = members.get(row);
switch(col){
case 0: return f.getmembId();
case 1: return f.getname();
case 2: return f.getemail();
case 3: return f.getcountry();
case 4: return f.getfavGenre();
case 5: return f.getgender();
case 6: return f.getdescription();
case 7: return f.getmemberType();
case 8: return f.getsongLimit();
case 9: return f.getcard_no();
case 10: return f.getexpiry_date();
}
return null;
}
public String getColumnName(int col){
return columnNames[col];
}
public member getRow(int row){
member c = members.get(row);
return c;
}
public Connection getConnection(){
Connection conDB = null;
/****** DEFAULT MYSQL DRIVERS **************************/
String url = connection.geturl();
String username = connection.getUsername();
String password = connection.getPassword();
try{
//load the MYSQL driver
Class.forName(connection.getDriver());
conDB = DriverManager.getConnection(url, username, password);
}
catch(Exception e){
}
return conDB;
}
//Load all DB values into ARRAY
public void LoadTableFromDB(){
Connection conDB = null;
Statement stmt = null;
ResultSet r = null;
try{
//Connection + Statement
conDB = getConnection();
stmt = conDB.createStatement();
//Queries
String sqlSelectAll = "SELECT * FROM members";
r = stmt.executeQuery(sqlSelectAll);
members.clear();
//Loop through the resultset
while(r.next()){
members.add(new member(r.getInt("membId"), r.getString("name"),
r.getString("email"), r.getString("country"), r.getString("favGenre"),
r.getString("gender"), r.getString("description"), r.getString("memberType"),
r.getString("songLimit"), r.getString("card_no"), r.getString("expiry_date")));
}
conDB.close(); // Close the DB connection
}//End of TRY
catch(Exception er){
System.out.println("Error was: " + er);
}
}
}
Here is how I've implemented the JTable:
public class ViewAll extends JFrame implements ActionListener{
//Jtextfields, buttons, labels
private JButton btnBack = new JButton("Back");
private static JLabel lblMembTitle = new JLabel("<html><h1>All Members</h1></html>");
private static JLabel lblPlayTitle = new JLabel("<html><h1>All Playlists</h1><br /></html>");
//Containers, Panels, Scrollpanes
private Container mainCon = this.getContentPane();
private static JPanel pnlTable = new JPanel(new BorderLayout());
//Jpanels - sections
private JPanel mainPanel = new JPanel();
private JPanel subPanel1 = new JPanel();
private JPanel subPanel2 = new JPanel();
private JPanel subPanel3 = new JPanel();
//Tables
private static JTable tblShowAllMemb = new JTable();
private static JTable tblShowAllPlay = new JTable();
JScrollPane scrollPane = new JScrollPane(mainPanel, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
public ViewAll(){
super("Search/Edit/Delete Members");
this.setBounds(400, 800, 854,400);
this.setVisible(true);
mainCon.add(scrollPane);
//Table Models:
MemTableModel tblMembers = new MemTableModel();
PlayTableModel tblPlaylist = new PlayTableModel();
//LAYOUT
/*By removing this the scrollpane works
^^mainPanel is already added to the scrollPane object above ^^
*/
// mainCon.add(mainPanel);
//Main Panel
mainPanel.setLayout(new BorderLayout());
mainPanel.add(BorderLayout.NORTH, subPanel1);
mainPanel.add(BorderLayout.CENTER, subPanel2);
//Panel1 - Member table + Back Button
subPanel1.setLayout(new BorderLayout());
subPanel1.add(BorderLayout.NORTH, btnBack);
subPanel1.add(BorderLayout.CENTER, lblMembTitle);
subPanel1.add(BorderLayout.SOUTH, tblShowAllMemb);
tblShowAllMemb.setModel(tblMembers);
btnBack.addActionListener(this);
//Panel2 - Playlist table
subPanel2.add(BorderLayout.NORTH, lblPlayTitle);
subPanel2.add(BorderLayout.CENTER, tblShowAllPlay);
tblShowAllPlay.setModel(tblPlaylist);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == btnBack){
this.dispose();
}
}
}
The likely issue is you've not wrapped the
JTable, which represents yourTableModelin aJScrollPaneas demonstrated in How to Use TablesBy simply using something like...
I can get:
See also How to Use Scroll Panes for more details
Updated based on updated code...
Not one of your tables is actually wrapped within it's own
JScrollPaneYou've just added the table by itself to some other container. Instead, consider using something like