SWT实现系统托盘效果

package lpp;    import org.eclipse.swt.*;    import org.eclipse.swt.graphics.*;    import org.eclipse.swt.layout.FillLayout;    import org.eclipse.swt.widgets.*;    public class TrayBySwt {     public static void main(String[] args) {      Display display = new Display();      final Shell shell = new Shell(display);      shell.setText("系统托盘BySwt");      shell.setLayout(new FillLayout());      Button button = new Button(shell, SWT.PUSH);      button.setText("隐藏窗口显示托盘图标");      ImageData imageData = new ImageData(      "E:\\workspace\\myeclipse66\\ra\\Tray\\src\\16.gif");      Image image = new Image(display, imageData);      // 取得系统托盘      final Tray tray = display.getSystemTray();      if (tray == null) {       System.out.println("当前操作系统不支持托盘图标");      } else {       final TrayItem item = new TrayItem(tray, SWT.NONE);       item.setToolTipText("我是托盘图标");       item.addListener(SWT.Show, new Listener() {        public void handleEvent(Event event) {         System.out.println("show");        }       });       item.addListener(SWT.Hide, new Listener() {        public void handleEvent(Event event) {         System.out.println("hide");        }       });       item.addListener(SWT.Selection, new Listener() {        public void handleEvent(Event event) {         System.out.println("selection");        }       });       final Menu menu = new Menu(shell, SWT.POP_UP);       for (int i = 0; i < 8; i++) {        MenuItem mi = new MenuItem(menu, SWT.PUSH);        mi.setText("Item" + i);        mi.addListener(SWT.Selection, new Listener() {         public void handleEvent(Event event) {          System.out.println("selection " + event.widget);         }        });        if (i == 0)       menu.setDefaultItem(mi);       }       item.addListener(SWT.MenuDetect, new Listener() {        public void handleEvent(Event event) {         menu.setVisible(true);        }       });       item.addListener(SWT.DefaultSelection, new Listener() {        public void handleEvent(Event event) {         shell.setVisible(true);         item.setVisible(false);        }       });       item.setImage(image);       button.addListener(SWT.Selection, new Listener() {        public void handleEvent(Event event) {         shell.setVisible(false);         item.setVisible(true);        }       });       item.setVisible(false);      }      shell.setBounds(50, 50, 300, 200);      shell.open();      while (!shell.isDisposed()) {       if (!display.readAndDispatch())        display.sleep();      }      image.dispose();      display.dispose();     }    }