Java编写小程序随机显示出13个颜色的彩色圆形和矩形

在Java中，我们可以利用Swing库创建一个图形界面程序，展示彩色圆形和矩形。这里是一个简单的示例，使用Random类生成随机颜色，并设置形状的颜色：

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

public class ColorShapeExample extends JFrame {
    private static final int SHAPE_COUNT = 13;
    private Random random;

    public ColorShapeExample() {
        // 初始化随机数生成器
        random = new Random();

        // 设置窗口的基本属性
        setTitle("Random Colored Shapes");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 添加绘图组件
        JPanel panel = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                
                for (int i = 0; i < SHAPE_COUNT; i++) {
                    int x = random.nextInt(getWidth());
                    int y = random.nextInt(getHeight());
                    int radius = random.nextInt(50) + 20;
                    Color color = new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256));

                    // 绘制圆形
                    g.setColor(color);
                    g.fillOval(x, y, radius * 2, radius * 2);

                    // 可能绘制矩形
                    if (random.nextBoolean()) {
                        int rectWidth = random.nextInt(radius * 2) + 40;
                        int rectHeight = random.nextInt(radius * 2) + 40;
                        g.fillRect(x, y, rectWidth, rectHeight);
                    }
                }
            }
        };

        setContentPane(panel);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ColorShapeExample();
            }
        });
    }
}