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Java Swing - 如何更改Java JTabbedPane插入顏色

我們想知道如何更改Java JTabbedPane插入顏色。 
import java.awt.Color;
import java.awt.Container;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

public class Main {
  public static void main(String[] args) {
    Container c1 = new GradientPanel();
    Container c2 = new GradientPanel();
    JTabbedPane top = new JTabbedPane();

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    top = new JTabbedPane(JTabbedPane.TOP);
    top.addTab("1", c1);
    top.addTab("2", c2);
    frame.add(top);
    frame.pack();
    frame.setVisible(true);
  }
}

class GradientPanel extends JPanel {
  public GradientPanel() {
    this.add(new JLabel("Here"));
  }
  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    GradientPaint p = new GradientPaint(0, 0, Color.white, getWidth(),
        getHeight(), Color.gray);
    g2d.setPaint(p);
    g2d.fillRect(0, 0, getWidth(), getHeight());
  }
}