JTable won't show column headers.

Question

I have the following code to instantiate a JTable: the table comes up with the right number of rows and columns, but there is no sign of the titles atop the columns.

public Panel1()
{
int  nmbrRows;

    setLayout(null);
    setBackground(Color.magenta);
    Vector colHdrs;

    //create column headers

    colHdrs = new Vector(10);
    colHdrs.addElement(new String("Ticker"));

//more statements like the above to establish all col. titles       

    nmbrRows = 25;
    DefaultTableModel tblModel = new DefaultTableModel(nmbrRows, colHdrs.size());
    tblModel.setColumnIdentifiers(colHdrs);

    scrTbl = new JTable(tblModel);
    scrTbl.setBounds(25, 50, 950, 600);
    scrTbl.setBackground(Color.gray);
    scrTbl.setRowHeight(23);    
    add(scrTbl);


//rest of constructor
...

}

Comparing this to other table-making code, I don't see any missing steps, but something must be absent.

Thanks in advance for any help.

Answer 1

Put your JTable inside a JScrollPane. Try this:

add(new JScrollPane(scrTbl));

Answer 2

If the columns names and number of rows are hard-coded, I would advise you to use the JTable constructor which takes an array of columns names instead of creating a model you do not re-use:

JTable(Object[][] rowData, Object[] columnNames) Constructs a JTable to display the values in the two dimensional array, rowData, with column names, columnNames.