Java Swing - 如何隐藏JFrame并通过单击托盘图标再次显示它

import java.awt.Image;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class Main {
  public static void main(String[] args) throws Exception {
    JFrame frm = new JFrame("Main");
    Image im = Toolkit.getDefaultToolkit().getImage("c:\\icons\\icon1.png");
    TrayIcon tri = new TrayIcon(im);
    tri.addActionListener(e -> {
      frm.setVisible(true);
      try {
        SystemTray.getSystemTray().remove(tri);
      } catch (Exception ex) {
        ex.printStackTrace();
      }
    });
    frm.addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent e) {
        try {
          SystemTray.getSystemTray().add(tri);
        } catch (Exception ex) {
          ex.printStackTrace();
        }
        frm.setVisible(false);
      }
    });
    frm.setSize(100, 100);
    frm.setVisible(true);
  }
}