Java – JTable column headings are not displayed, but ‘a’, ‘B’,

I'm new to the Java GUI and I'm trying to make a table containing my socerteam score results

At first I used the defaulttablemodel, and there was no problem with my column name They performed well with JScrollPane Then I want to try to implement my own tablemodel, and I will never see my table column header again They are displayed as' a ',' B ',' g ', and I'm still using scrollpane I need this tablemodel because I plan to add something else with exactly the same structure

Anyone can help me and try to solve the problem

thank you

class MyTableModel extends AbstractTableModel{  
    private String[] titles;  
    private Object[][] data;

    public MyTableModel(String [] t,Object [][] d){
        this.titles = t;
        this.data   = d;
    }
    public Object getValueAt(int row,int col){
        return data[row][col];
    }
    public int getColumnCount(){
        return titles.length;
    }
    public int getRowCount(){
        return data.length;
    }
}

public static void main(String[] args) {  
    SwingUtilities.invokelater(new Runnable() {  
        public void run() {  
            createAndShowGUI();  
        }  
    });  
}

public JPanel createContentPane(){
    mainPanel = new JPanel();
    mainPanel.setLayout(new BorderLayout(10,10));

    String [] titles = {"Naam","Doelpunten","% Doelpunten","Assists","% Assists","","% Totaal"};
    Object [][] data = new Object[spelers.size()][titles.length];
    int counter = 0;
    spelers = getSpelersFromDB("all");
    for (Iterator<Speler> iter = spelers.iterator(); iter.hasNext();){
        Speler temp = iter.next();
        data[counter][0] = temp.naam;
        data[counter][1] = temp.doelpunten;
        data[counter][2] = String.format("%3.1f %%",berekenPercentageDoelpunten(temp));
        data[counter][3] = temp.assists;
        data[counter][4] = String.format("%3.1f %%",berekenPercentageAssists(temp));
        data[counter][5] = "";
        data[counter][6] = String.format("%3.1f %%",berekenTotaalPercentage(temp));
        counter += 1;
    }

    JTable table = new JTable(new MyTableModel(titles,data));

    JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setPreferredSize(new Dimension(500,500));
    mainPanel.add(scrollPane,BorderLayout.CENTER);
    mainPanel.setOpaque(true);
    return mainPanel;
}

private static void createAndShowGUI(){
    frame.setMinimumSize(new Dimension(700,300));
    frame.setPreferredSize(new Dimension(700,500));
    frame.setMaximumSize(new Dimension(800,800));

    Voetbal demo = new Voetbal();
    frame.setContentPane(demo.createContentPane());
    frame.setJMenuBar(demo.createJMenuBar());
    frame.setVisible(true);
    frame.pack();
    frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
}

Solution

Abstracttablemodel will always return 'a', 'B' As the column name (check the document), all you need to do is override the getcolumnname() method, for example:

public String getColumnName(int column) {
        return titles[column]
    }