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Java Swing - 如何显示在摇摆螺纹的图象标签

jlabel 【jlabel】
我们想知道如何显示在摇摆螺纹的图象标签。
代码展示 运行结果 
import java.awt.Image;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

public class Main {

  public static void main(String[] args) throws Exception {
    URL url = new URL("http://www.w3cschool.cn/style/download.png");
    final Image img = ImageIO.read(url);

    Runnable r = new Runnable() {

      @Override
      public void run() {
        JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(img)));
      }
    };
    SwingUtilities.invokeLater(r);
  }
}