JTable header not showing

问题

JTable header not showing...

My JTable header wont show even if add it into a container like JScrollPane...tell me why is it happen and how can i fix it or debug it.. I search through internet and all they saying is add container to your jtable, i did but still my header are not showing.

---

public void table(){

try{

        rs = stat.executeQuery("SELECT * FROM payments;");

        Vector<String> header = new Vector<String>();

        header.add("PAYMENT"); 
        header.add("AMOUNT");
        header.add("MODIFIER");
        header.add("DATE MODIFIED");

        Vector<Vector<Object>> data = new  Vector<Vector<Object>>();

        while(rs.next()) {

            Vector<Object> row = new Vector<Object>();

            row.add(rs.getString("description"));
            row.add(rs.getString("amount")); 
            row.add(rs.getString("remarks")); 
            row.add(rs.getString("date"));


            data.add(row);

        } // loop

        table = new JTable(data, header);

        JScrollPane scrollPane = new JScrollPane(table);

        panel.add(table);
        panel.add(table.getTableHeader());
        //panel.removeAll();
        //scroll.add(table);
        validate();

    }catch(Exception e){
        System.out.println("Error in table: "+e);
    }//try and catch

}

回答1:

Start by removing

panel.add(table.getTableHeader());

The JTable is designed to add it's header to the JScrollPane. An instance of a component can only belong to a one parent/container, the above line is removing it from the scrollpane

Also, change this...

panel.add(table);

To

panel.add(scrollPane);

回答2:

Same problem I have face You have to add the JTable to the JScrollPane then add JscrollPane to JFrame e.g.

JTable table = new JTable();
JScrollPane scrollPane= new  JScrollPane(table);
frame.add(scrollPane);

来源：https://stackoverflow.com/questions/19065970/jtable-header-not-showing