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为java的窗口实例设置小图标，最好是PNG格式的

import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;

public class Frame extends JFrame {
 
          public static void main(String[] args) {
                    new Frame().launchFrame();
          }
 
          public void launchFrame() {
                      setSize(300,300);
                      setTitle("窗口示例");

                      //获取图片并设为窗口图标，注意，这里的images文件夹必须和Frame.java文件在同一个包中

                       java.net.URL imgURL = Frame.class.getResource("/images/yourImage.png");
                       ImageIcon imgIcon = new ImageIcon(imgURL);
                       Image img = imgIcon.getImage();
                       this.setIconImage(img);

                      //将窗口显示在屏幕正中
                      this.setLocationRelativeTo(null);
                      setVisible(true);
           }

}