使用平滑外观更改JButton文本和BackGround颜色

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

JFrame frame = new JFrame("平滑外观示例");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setLayout(new FlowLayout());

JButton button = new JButton("按钮");
button.setPreferredSize(new Dimension(100, 50));

ButtonUI smoothUI = new BasicButtonUI() {
    @Override
    public void paint(Graphics g, JComponent c) {
        Graphics2D g2 = (Graphics2D) g.create();
        AbstractButton button = (AbstractButton) c;
        if (button.getModel().isPressed()) {
            g2.setColor(Color.RED);
            button.setForeground(Color.WHITE);
        } else {
            g2.setColor(Color.BLUE);
            button.setForeground(Color.BLACK);
        }
        g2.fillRect(0, 0, c.getWidth(), c.getHeight());
        g2.dispose();
        super.paint(g, c);
    }
};

button.setUI(smoothUI);

frame.add(button);

frame.setVisible(true);