java一朵玫瑰花代码

这是一个简单的 Java 程序，画一朵玫瑰花：

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

public class Rose extends JFrame {
  public Rose() {
    super("玫瑰花");
    Container content = getContentPane();
    content.setLayout(new BorderLayout());
    JPanel rose = new JPanel() {
      protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        int xcenter = getWidth() / 2;
        int ycenter = getHeight() / 2;
        double radius = Math.min(getWidth(), getHeight()) * 0.4;
        RoseCurve rose = new RoseCurve(xcenter, ycenter, radius);
        g2.setStroke(new BasicStroke(2.0f));
        g2.setColor(Color.red);
        g2.draw(rose);
      }
    };
    content.add(rose, BorderLayout.CENTER);
    setSize(400, 400);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
  }

  class RoseCurve extends GeneralPath {
    RoseCurve(double xcenter, double ycenter, double radius) {
      moveTo(xcenter + radius, ycenter);
      for (int deg = 45; deg < 360; deg += 45) {
        double rad = Math.toRadians(deg);
        double x = xcenter + Math.cos(rad) * radius;
        double y = ycenter + Math.sin(rad) * radius;
        lineTo(x, y);
      }
      closePath();
    }
  }

  public static void main(String[] args) {
    new Rose();
  }
}

这个程序使用了 Java 图形绘制和事件处理的基本知识，绘制出了一朵玫瑰花的图形。