import java.awt.*; import javax.swing.*; public class Test extends JPanel { private JFrame frame = null; private int r = 50; // 半径 private int[] x = new int[5]; // 5个X顶点坐标 private int[] y = new int[5]; // 5个Y顶点坐标 public Test() { this.math(); frame = new JFrame("五角星"); frame.getContentPane().add(this); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300, 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); } } public void paint(Graphics g) { super.paint(g); 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 Test(); } }参考文献：