How to remove border of column headings in JTable?

Question

My question is about removing column heading borders in JTable.

My class extends JTable and therefore, I was able to erase all other borders by doing:

super.setShowHorizontalLines(false);
super.setShowVerticalLines(false);

But this does not erase the borders in the column header. How to do it?

Answer 1

you need to extract TableHeader from TableHeader and install Border there, for example, Borders only changed to 1st. Column

 import java.awt.*; import javax.swing.*; import javax.swing.border.Border; import javax.swing.table.*; public class LabelHeaderSample { public static void main(String args[]) { Icon redIcon = new DiamondIcon(Color.red); Icon blueIcon = new DiamondIcon(Color.blue); Object rows[][] = {{"one", "ichi - \u4E00", new DiamondIcon(Color.red)}, {"two", "ni - \u4E8C", new DiamondIcon(Color.red)}, {"three", "san - \u4E09", new DiamondIcon(Color.red)}, {"four", "shi - \u56DB", new DiamondIcon(Color.red)}, {"five", "go - \u4E94", new DiamondIcon(Color.red)}, {"six", "roku - \u516D", new DiamondIcon(Color.red)}, {"seven", "shichi - \u4E03", new DiamondIcon(Color.red)}, {"eight", "hachi - \u516B", new DiamondIcon(Color.red)}, {"nine", "kyu - \u4E5D", new DiamondIcon(Color.red)}, {"ten", "ju - \u5341", new DiamondIcon(Color.red)}}; JFrame frame = new JFrame("Label Header"); String headers[] = {"English", "Japanese", "Icon"}; JTable table = new JTable(rows, headers); JScrollPane scrollPane = new JScrollPane(table); Border headerBorder = UIManager.getBorder("TableHeader.cellBorder"); JLabel blueLabel = new JLabel(headers[0], blueIcon, JLabel.CENTER); blueLabel.setBorder(null);// < - - - here you set Borders JLabel redLabel = new JLabel(headers[1], redIcon, JLabel.CENTER); redLabel.setBorder(headerBorder); TableCellRenderer renderer = new JComponentTableCellRenderer(); TableColumnModel columnModel = table.getColumnModel(); TableColumn column0 = columnModel.getColumn(0); TableColumn column1 = columnModel.getColumn(1); TableColumn column2 = columnModel.getColumn(2); column0.setHeaderRenderer(renderer); column0.setHeaderValue(blueLabel); column1.setHeaderRenderer(renderer); column1.setHeaderValue(redLabel); table.setPreferredScrollableViewportSize(table.getPreferredSize()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(scrollPane, BorderLayout.CENTER); frame.pack(); frame.setVisible(true); } private LabelHeaderSample() { } } class DiamondIcon implements Icon { private Color color; private boolean selected; private int width; private int height; private Polygon poly; private static final int DEFAULT_WIDTH = 10; private static final int DEFAULT_HEIGHT = 10; public DiamondIcon(Color color) { this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT); } public DiamondIcon(Color color, boolean selected) { this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT); } public DiamondIcon(Color color, boolean selected, int width, int height) { this.color = color; this.selected = selected; this.width = width; this.height = height; initPolygon(); } private void initPolygon() { poly = new Polygon(); int halfWidth = width / 2; int halfHeight = height / 2; poly.addPoint(0, halfHeight); poly.addPoint(halfWidth, 0); poly.addPoint(width, halfHeight); poly.addPoint(halfWidth, height); } public int getIconHeight() { return height; } public int getIconWidth() { return width; } public void paintIcon(Component c, Graphics g, int x, int y) { g.setColor(color); g.translate(x, y); if (selected) { g.fillPolygon(poly); } else { g.drawPolygon(poly); } g.translate(-x, -y); } } class JComponentTableCellRenderer implements TableCellRenderer { public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { return (JComponent) value; } }