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Invisible JTable Column Header!

 
Greenhorn
Posts: 6
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I create a table but cannot see the Column Headers.
I only see Data Rows. How can I see the headers?
My code:
jTable1 = new JTable();
.
.
String [] columnNames = {"xxx","xxx",xxx",....}
DefaultTableModel model = new DefaultTableModel(columnNames,numberOfRows);
jTable1.setModel( model);
ATTENTION : I don't want to use jTable(Object[],Object[]) Constructor.
 
Greenhorn
Posts: 15
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this code takes the column names from the vector. u can have anu data container to hold the names of the headers. but all u must do is to implement the methods in the AbstractTable in a way suitable for ur datacontainer

import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.JScrollPane;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
public class MyTableModel extends AbstractTableModel
{


Vector data = new Vector();
Vector dataContent= new Vector();
Vector columnNames= new Vector();
static int count=1;


public MyTableModel()
{

columnNames.add("Sl No:");
columnNames.add("Mem Code/ AC no:");
columnNames.add("Crew ID.");
columnNames.add("Amount");
columnNames.add("Delete");
dataContent.add(new Integer(count));
dataContent.add(new Integer(0));
dataContent.add(new Integer(0));
dataContent.add(new Double(0.00));
dataContent.add(new Boolean(false));

data.add(dataContent);

}

public int getColumnCount() {
return columnNames.size();
}

public int getRowCount()
{
return data.size();
}

public String getColumnName(int col)
{
return (String)columnNames.get(col);
}

public Object getValueAt(int row, int col)
{
Vector temp = (Vector)data.get(row);

return temp.get(col);
}

/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int c)
{
return getValueAt(0, c).getClass();
}

/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col)
{
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col ==0)
return false;
else
return true;

}

/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col)
{


Vector temp =(Vector)data.get(row);
System.out.println(temp);
temp.removeElementAt(col);
temp.insertElementAt(value,col);
data.removeElementAt(row);
data.insertElementAt(temp,row);
fireTableCellUpdated(row, col);
/*
Deleting a row if the Boolean is true
*/
if(col==4)
{
count --;// decresing the count
printDebugData();

data.removeElementAt(row);
for (int i = row;i<data.size();i++)>
{
Vector temp1=new Vector((Vector)data.get(i));
System.out.println(temp1);
int tempcount=((Integer)temp1.get(0)).intValue();
tempcount --;
temp1.removeElementAt(0);
temp1.insertElementAt(new Integer(tempcount),0);
data.removeElementAt(i);
data.insertElementAt(temp1,i);
}
/*
To notify the model that the row has been deleted
*/
fireTableRowsDeleted(data.size(),data.size()+1);

}
printDebugData();
Value.setTotal(getTotal());
System.out.println("Total= "+getTotal());
}

public void addRow()
{
Vector newContent= new Vector();
count++;

newContent.add(new Integer(count));
newContent.add(new Integer(1));
newContent.add(new Integer(1));
newContent.add(new Double(0.00));
newContent.add(new Boolean (false));

data.add(newContent);
fireTableRowsInserted(data.size(),data.size());


}
private void printDebugData()
{
int numRows = getRowCount();
int numCols = getColumnCount();

for (int i=0; i < data.size(); i++)
{
Vector temp= (Vector)data.get(i);
for (int j=0; j < temp.size(); j++)
{
System.out.print(temp.get(j));
}
System.out.println();
System.out.println("--------------------------");
}
System.out.println("--------------------------");
System.out.println("the size is "+data.size());
}

public double getTotal()
{

/*
Calculates the total amount in the data vector
*/
double ret=0.00;
for (int i =0; i<data.size();i++ )>
{
Vector temp=(Vector)data.get(i);

ret=ret+((Double)temp.get(3)).doubleValue();
}
return ret;
}
}
 
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