急求JAVA写五角星的程序代码！

急求JAVA写五角星的程序代码！

import java.awt.*;
import javax.swing.*;
public class WuJiaoXing extends JPanel {
    private static final long serialVersionUID = 1L;
    private JFrame frame = null;
    private int r = 150; // 外顶点外接圆半径
    private int[] x = new int[5]; // 5个X外顶点坐标
    private int[] y = new int[5]; // 5个Y外顶点坐标
    private int[] x_ = new int[5]; // 5个X内顶点坐标
    private int[] y_ = new int[5]; // 5个Y内顶点坐标
    public WuJiaoXing() {
    this.math();
    frame = new JFrame("五角星");
    frame.getContentPane().add(this);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(500,500);
    frame.setLocation(200, 200);
    frame.setVisible(true);
    }
    private void math() {
    int c = 360 / 5; // 角度
    for (int i = 0; i < 5; i++) {
    x[i] = (int) (Math.cos(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
    y[i] = (int) (Math.sin(i * c * Math.PI / 30 - Math.PI / 2) * (r) + r);
    }
    int r_ = (int) (r * Math.sin(18 * Math.PI / 180) / Math
    .sin(126 * Math.PI / 180)); // 内顶点外接圆半径
    for (int i = 0; i < 5; i++) {
    x_[i] = (int) (Math.cos((i * c + 18) * Math.PI / 30 - Math.PI / 2)
    * (r_) + r);
    y_[i] = (int) (Math.sin((i * c + 18) * Math.PI / 30 - Math.PI / 2)
    * (r_) + r);
    }
    }
    public void paint(Graphics g) {
    super.paint(g);
    g.setColor(Color.YELLOW);
    // g.setBackground(Color.RED);
    // 填充
    int[] x1 = { x[0], x[2], x_[2] };
    int[] y1 = { y[0], y[2], y_[2] };
    int[] x2 = { x[1], x[3], x_[3] };
    int[] y2 = { y[1], y[3], y_[3] };
    int[] x3 = { x[2], x[4], x_[4] };
    int[] y3 = { y[2], y[4], y_[4] };
    g.fillPolygon(x1, y1, 3);
    g.fillPolygon(x2, y2, 3);
    g.fillPolygon(x3, y3, 3);
    // 描边
    // g.setColor(Color.BLACK);
    // g.drawLine(x[0], y[0], x[2], y[2]);
    // g.drawLine(x[0], y[0], x[3], y[3]);
    // g.drawLine(x[1], y[1], x[3], y[3]);
    // g.drawLine(x[1], y[1], x[4], y[4]);
    // g.drawLine(x[2], y[2], x[4], y[4]);
    // g.drawLine(x[2], y[2], x[0], y[0]);
    }
    public static void main(String[] args) {
    new WuJiaoXing();
    }
}