如何在一个JText区域中显示多个选中行的值

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class SelectedRowsDemo extends JFrame {
    private JTable table;
    private JTextArea textArea;

    public SelectedRowsDemo() {
        setTitle("Selected Rows Demo");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // 创建一个表格
        String[] columnNames = {"ID", "Name", "Age"};
        Object[][] data = {
                {1, "Alice", 25},
                {2, "Bob", 30},
                {3, "Charlie", 35},
                {4, "David", 40}
        };
        table = new JTable(data, columnNames);

        // 创建一个显示选中行的JText区域
        textArea = new JTextArea();
        textArea.setEditable(false);

        // 创建一个按钮，点击时显示选中行的值
        JButton button = new JButton("Show Selected Rows");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 获取选中行的索引
                int[] selectedRows = table.getSelectedRows();

                // 构建显示字符串
                StringBuilder sb = new StringBuilder();
                for (int row : selectedRows) {
                    for (int col = 0; col < table.getColumnCount(); col++) {
                        sb.append(table.getValueAt(row, col)).append("\t");
                    }
                    sb.append("\n");
                }

                // 设置JText区域的文本
                textArea.setText(sb.toString());
            }
        });

        // 将表格和按钮添加到窗口中
        add(new JScrollPane(table), BorderLayout.CENTER);
        add(button, BorderLayout.SOUTH);
        add(new JScrollPane(textArea), BorderLayout.EAST);

        pack();
        setLocationRelativeTo(null);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new SelectedRowsDemo().setVisible(true);
            }
        });
    }
}