java - JTableヘッダーの間隔

Question

以下に示すように、スペーシングJTableセルは非常に単純です。

int gapWidth = 10;
int gapHeight = 5;
table.setIntercellSpacing(new Dimension(gapWidth, gapHeight));

このような間隔は、テーブルヘッダーに影響を与えないようです。同じ寸法でヘッダーの間隔を空ける方法はありますか？

Answer 1

Easiest way could be to set EmptyBorders to the JTableHeader inside the TableCellRenderer

The code above does my spacing, but the alignment of header and the actual row cell values looks slighly off - as a result of spacing only placed on cells but not the header.

I added a SSCCE (3mins 27seconds inc. uploading here)

from code

import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

public class IntercellSpacingTableHeader {

    private JFrame frame = new JFrame("Table Demo");
    private String[] columnNames = {"String", "Integer", "Float", "Double"};
    private Object[][] data = {
        {"aaa", new Integer(12), new Float(12.15), new Double(100.05)},
        {"bbb", new Integer(5), new Float(7.154), new Double(6.1555)},
        {"CCC", new Integer(92), new Float(0.1135), new Double(3.1455)},
        {"ddd", new Integer(12), new Float(31.15), new Double(10.05)},
        {"eee", new Integer(5), new Float(5.154), new Double(16.1555)},
        {"fff", new Integer(92), new Float(4.1135), new Double(31.1455)}};
    private TableModel model = new DefaultTableModel(data, columnNames) {

        private static final long serialVersionUID = 1L;

        @Override
        public Class<?> getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }
    };
    private JTable table = new JTable(model);

    public IntercellSpacingTableHeader() {
        int gapWidth = 10;
        int gapHeight = 5;
        table.setIntercellSpacing(new Dimension(gapWidth, gapHeight));
        table.setRowHeight(20);
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scroll = new JScrollPane(table);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scroll);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new IntercellSpacingTableHeader();
            }
        });
    }
}