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在Java中，你可以使用Java2D库来实现打印空心菱形。以下是一个简单的示例代码：
import javax.swing.*; import java.awt.*; public class DiamondPattern { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { JFrame frame = new JFrame("Diamond Pattern"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400, 400); frame.setLayout(new BorderLayout()); JPanel panel = new JPanel() { @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); int width = getWidth(); int height = getHeight(); int size = Math.min(width, height) / 2; // Draw the upper and lower halves of the diamond drawUpperHalf(g2d, width, height, size); drawLowerHalf(g2d, width, height, size); } private void drawUpperHalf(Graphics2D g2d, int width, int height, int size) { for (int i = 0; i < size; i++) { int x = (width - size) / 2 + i; int y = height / 2 - i; g2d.fillOval(x, y, size, size); } } private void drawLowerHalf(Graphics2D g2d, int width, int height, int size) { for (int i = 0; i < size; i++) { int x = (width - size) / 2 + i; int y = height / 2 + i; g2d.fillOval(x, y, size, size); } } }; frame.add(panel); frame.setVisible(true); }); } } 这个代码会创建一个窗口，并在其中绘制一个空心菱形。你可以根据需要调整窗口的大小或者使用不同的颜色。
