import java.awt.AWTException;import java.awt.MenuItem;import java.awt.PopupMenu;import java.awt.SystemTray;import java.awt.TrayIcon;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.ImageIcon;import javax.swing.JFrame;public class TestTray extends JFrame { private static final long serialVersionUID = -7078030311369039390L; public TestTray() { this.setSize(500, 400); this.setLocationRelativeTo(null);// 把窗體設置在屏幕中間 systemTray(); // 設置系統托盤 // 添加關閉按鈕事件，關閉時候實質是把窗體隱藏 this.addWindowListener(new WindowAdapter() {  @Override  public void windowClosing(WindowEvent e) {  TestTray.this.setVisible(false);  } }); this.setVisible(true); } /** * 處理系統托盤 */ private void systemTray() { if (SystemTray.isSupported()) { // 判斷系統是否支持托盤功能.  // 創建托盤右擊彈出菜單  PopupMenu popupMenu = new PopupMenu();    //創建彈出菜單中的退出項  MenuItem itemExit = new MenuItem("退出系統");  itemExit.addActionListener(new ActionListener() {   @Override   public void actionPerformed(ActionEvent e) {    System.exit(0);   }   });  popupMenu.add(itemExit);    //創建托盤圖標  ImageIcon icon = new ImageIcon("img/icon.png"); // 創建圖片對象  TrayIcon trayIcon = new TrayIcon(icon.getImage(), "測試系統托盤",   popupMenu);  trayIcon.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {   TestTray.this.setVisible(true);  }  });    //把托盤圖標添加到系統托盤  //這個可以點擊關閉之后再放到托盤里面，在此是打開程序直接顯示托盤圖標了  try {  SystemTray.getSystemTray().add(trayIcon);  } catch (AWTException e1) {  e1.printStackTrace();  } } } public static void main(String[] args) { new TestTray(); }}