排序箭头 jtable 列标题

import javax.swing.*;
import javax.swing.table.*;

public class SortArrowExample {
    public static void main(String[] args) {
        // 创建一个 jtable 实例
        JTable table = new JTable(new DefaultTableModel(new Object[][] {
            {"A", "B", "C"},
            {"1", "2", "3"},
            {"X", "Y", "Z"}
        }, new Object[] {"Column 1", "Column 2", "Column 3"}));

        // 创建一个表头渲染器，用于在表头中添加排序箭头
        TableCellRenderer headerRenderer = new DefaultTableCellRenderer() {
            @Override
            public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
                super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
                setHorizontalTextPosition(SwingConstants.LEFT);
                setIcon(table.getColumnModel().getColumn(column).getHeaderValue().equals(table.getSortedColumn()) ?
                        new ImageIcon(getClass().getResource("/sort_arrow_down.png")) : null);
                return this;
            }
        };

        // 设置表头渲染器
        table.getTableHeader().setDefaultRenderer(headerRenderer);

        // 添加鼠标点击事件监听器，用于切换排序方式
        table.getTableHeader().addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                int column = table.getTableHeader().columnAtPoint(e.getPoint());
                if (column != -1) {
                    table.setSortedColumn(table.getSortedColumn() == column ? -1 : column);
                    table.repaint();
                }
            }
        });

        // 创建一个 jframe 实例，用于显示 jtable
        JFrame frame = new JFrame("Sort Arrow Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new JScrollPane(table));
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}