Java Utililty Methods JTable Header

void AddToTable(JTable tbl, Object[] obj, boolean head)
Add To Table

int size = tbl.getRowCount();
DefaultTableModel tableModel = (DefaultTableModel) tbl.getModel();
if (head) {
 tableModel.insertRow(0, obj);
} else {
 tableModel.insertRow(size, obj);

void adjustHeader(JTable table)
adjust Header

TableCellRenderer headerRenderer = table.getTableHeader().getDefaultRenderer();
for (int i = 0; i < table.getColumnCount(); i++) {
 TableColumn column = table.getColumnModel().getColumn(i);
 Component header = headerRenderer.getTableCellRendererComponent(table, column.getHeaderValue(), false,
 false, 0, i);
 column.setPreferredWidth(header.getPreferredSize().width + 8);

int calcHeaderWidth(int col)
calcs the optimal header width of the given column

return calcHeaderWidth(getJTable(), col);

int calcHeaderWidth(JTable table, int col)
Calculates the optimal width for the header of the given table.

if (table == null)
 return -1;
if (col < 0 || col > table.getColumnCount()) {
 System.out.println("invalid col " + col);
 return -1;
JTableHeader header = table.getTableHeader();
TableCellRenderer defaultHeaderRenderer = null;
...

void cleanHeaderCells(JTable table)
clean Header Cells

for (int cCnt = 0; cCnt < table.getColumnCount(); ++cCnt) {
 if (table.getValueAt(0, cCnt) == null) {
 table.setValueAt("", 0, cCnt);
 } else {
 String cellValue = (String) table.getValueAt(0, cCnt);
 if (cellValue.length() > 0) {
 for (int cnt = 0; cnt < badChars.length; ++cnt) {
 int indexValue = -1;
...

Border createTableHeaderEmptyColumnPainter(final JTable table)
Creates a Border that paints any empty space to the right of the last column header in the given JTable 's JTableHeader .

return new AbstractBorder() {
 @Override
 public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
 JViewport viewport = (JViewport) table.getParent();
 if (viewport != null && table.getWidth() < viewport.getWidth()) {
 int startX = table.getWidth();
 int emptyColumnWidth = viewport.getWidth() - table.getWidth();
 paintHeader(g, table, startX, emptyColumnWidth);
...

int getColumnHeaderWidth(TableColumn col, JTable table)
Figures out the width of the column header for the given TableColumn.

String methodName = MODULE_NAME + "getColumnHeaderWidth(TableColumn.JTable)";
int retval = -1;
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer != null) {
 Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0,
 0);
 retval = comp.getPreferredSize().width;
} else 
...

Dimension getHeaderDimension(JTable table, TableColumn tableColumn)
get Header Dimension

TableCellRenderer renderer = tableColumn.getHeaderRenderer();
if (renderer == null) {
 renderer = table.getTableHeader().getDefaultRenderer();
Component comp = renderer.getTableCellRendererComponent(table, tableColumn.getHeaderValue(), false, false,
 0, 0);
return comp.getPreferredSize();

int getMaxColumnWidth(JTable aTable, int columnNo, boolean includeColumnHeaderWidth, int columnPadding)
get Max Column Width

TableColumn column = aTable.getColumnModel().getColumn(columnNo);
Component comp = null;
int maxWidth = 0;
if (includeColumnHeaderWidth) {
 TableCellRenderer headerRenderer = column.getHeaderRenderer();
 if (headerRenderer != null) {
 comp = headerRenderer.getTableCellRendererComponent(aTable, column.getHeaderValue(), false, false,
 0, columnNo);
...

int getSelectedColumn(JTableHeader tableHeader)
Get's the selected column header for the given JTableHeader .

Object selectedColumnValue = tableHeader.getClientProperty(SELECTED_COLUMN_KEY);
return selectedColumnValue != null && selectedColumnValue instanceof Integer
 ? ((Integer) selectedColumnValue)
 : NO_COLUMN;