Java Swing - 如何获取/设置JTable中单元格之间的间隙大小...

import java.awt.Color;

import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.JTableHeader;

public class Main {
  public static void main(String[] args) {
    Integer[][] data = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
    String[] cols = { "A", "B", "C" };

    JTable table = new JTable(data, cols);

    JTableHeader header = table.getTableHeader();
    header.setBackground(Color.black);
    header.setForeground(Color.yellow);

    JOptionPane.showMessageDialog(null, new JScrollPane(table));
  }
}