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.

Answer 1

Put your JTable inside a JScrollPane. Try this:

add(new JScrollPane(scrTbl));

Answer 2

The main difference between this answer and the accepted answer is the use of setViewportView() instead of add().

How to put JTable in JScrollPane using Eclipse IDE:

1. Create JScrollPane container via Design tab.
2. Stretch JScrollPane to desired size (applies to Absolute Layout).
3. Drag and drop JTable component on top of JScrollPane (Viewport area).

In Structure > Components, table should be a child of scrollPane.

The generated code would be something like this:

JScrollPane scrollPane = new JScrollPane();
...

JTable table = new JTable();
scrollPane.setViewportView(table);

Answer 3

As said in previous answers the 'normal' way is to add it to a JScrollPane, but sometimes you don't want it to scroll (don't ask me when:)). Then you can add the TableHeader yourself. Like this:

JPanel tablePanel = new JPanel(new BorderLayout());
JTable table = new JTable();
tablePanel.add(table, BorderLayout.CENTER);
tablePanel.add(table.getTableHeader(), BorderLayout.NORTH);

Answer 4

    public table2() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 485, 218);
    setTitle("jtable");
    getContentPane().setLayout(null);

    String data[][] = { { "Row1/1", "Row1/2", "Row1/3" },
            { "Row2/1", "Row2/2", "Row2/3" },
            { "Row3/1", "Row3/2", "Row3/3" },
            { "Row4/1", "Row4/2", "Row4/3" }, };

    String header[] = { "Column 1", "Column 2", "Column 3" };

    // Table
    JTable table = new JTable(data,header);


    // ScrollPane
    JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setBounds(36, 37, 407, 79);
    getContentPane().add(scrollPane);

   }

}

try this!!