从 JScrollPane 中的 Swing Scrollbar 中删除箭头

import javax.swing.*;
import javax.swing.plaf.basic.BasicArrowButton;
import javax.swing.plaf.basic.BasicScrollBarUI;
import java.awt.*;

public class NoArrowScrollBarUI extends BasicScrollBarUI {

    @Override
    protected JButton createDecreaseButton(int orientation) {
        return new BasicArrowButton(orientation);
    }

    @Override
    protected JButton createIncreaseButton(int orientation) {
        return new BasicArrowButton(orientation);
    }

    @Override
    protected void paintArrow(Graphics g, int direction, Rectangle arrowRect) {
        // Do not paint the arrow
    }

    @Override
    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
        // Paint the track as usual
        super.paintTrack(g, c, trackBounds);
    }

    @Override
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
        // Paint the thumb as usual
        super.paintThumb(g, c, thumbBounds);
    }
}

import javax.swing.*;

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("Remove Arrows from JScrollPane");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(400, 400);

            JTextArea textArea = new JTextArea(10, 30);
            JScrollPane scrollPane = new JScrollPane(textArea);

            scrollPane.getVerticalScrollBar().setUI(new NoArrowScrollBarUI());
            scrollPane.getHorizontalScrollBar().setUI(new NoArrowScrollBarUI());

            frame.add(scrollPane);
            frame.setVisible(true);
        });
    }
}