JTable不在Jframe中显示

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

public class JTableExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JTable Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建表格数据
        Object[][] data = {
                {"John", 25, "USA"},
                {"Alice", 30, "Canada"},
                {"Bob", 35, "UK"}
        };

        // 创建表格列名
        String[] columnNames = {"Name", "Age", "Country"};

        // 创建JTable
        JTable table = new JTable(data, columnNames);

        // 将JTable添加到JFrame中
        frame.getContentPane().add(new JScrollPane(table));

        frame.pack();
        frame.setVisible(true);
    }
}