如何刪除JTable中列標題的邊框？

Question

我的問題涉及刪除JTable中列標題的邊框。

我的類擴展JTable中，因此我設法做刪除所有其他邊界：

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

但這並不能抹去的邊界在列標題。這個怎麼做？

Answer 1

您必須從TableHeader中提取JLabel並在那裏設置Border，例如，僅在1st中更改Borders。 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; 
    } 
}