删除JTabbedPane"当前选中"的虚线

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

public class MainFrame extends JFrame {
    private JTabbedPane tabbedPane;

    public MainFrame() {
        // 创建JTabbedPane
        tabbedPane = new JTabbedPane();

        // 添加选项卡
        tabbedPane.addTab("Tab 1", new JLabel("Content 1"));
        tabbedPane.addTab("Tab 2", new JLabel("Content 2"));
        tabbedPane.addTab("Tab 3", new JLabel("Content 3"));

        // 设置当前选中的选项卡
        tabbedPane.setSelectedIndex(1);

        // 移除虚线边框
        int selectedIndex = tabbedPane.getSelectedIndex();
        tabbedPane.setTabComponentAt(selectedIndex, new JLabel());

        // 添加JTabbedPane到窗口
        add(tabbedPane);

        // 设置窗口属性
        setTitle("JTabbedPane Demo");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(MainFrame::new);
    }
}