Added a test call to the system tray displaying a message

src/main/java/envoy/client/ui/ChatWindow.java

@@ -1,11 +1,17 @@
 package envoy.client.ui;
 
+import java.awt.AWTException;
 import java.awt.Color;
 import java.awt.ComponentOrientation;
 import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
+import java.awt.Image;
 import java.awt.Insets;
+import java.awt.SystemTray;
+import java.awt.Toolkit;
+import java.awt.TrayIcon;
+import java.awt.TrayIcon.MessageType;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;
@@ -37,7 +43,7 @@ import envoy.schema.User;
  * Project: <strong>envoy-client</strong><br>
  * File: <strong>ChatWindow.java</strong><br>
  * Created: <strong>28 Sep 2019</strong><br>
- * 
+ *
  * @author Kai S. K. Engelbart
  * @author Maximilian K&auml;fer
  * @author Leon Hofmeister
@@ -122,13 +128,11 @@ public class ChatWindow extends JFrame {
 
 			@Override
 			public void keyReleased(KeyEvent e) {
-
 				if (e.getKeyCode() == KeyEvent.VK_ENTER && ((SettingsScreen.enterToSend && e.getModifiersEx() == 0)
 						|| (e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK))) {
 
 					postMessage(messageList);
 				}
-
 			}
 		});
 		// Checks for changed Message
@@ -287,7 +291,7 @@ public class ChatWindow extends JFrame {
 	/**
 	 * Initializes the elements of the user list by downloading them from the
 	 * server.
-	 * 
+	 *
 	 * @since Envoy v0.1-alpha
 	 */
 	private void loadUsersAndChats() {
@@ -308,7 +312,7 @@ public class ChatWindow extends JFrame {
 	/**
 	 * Updates the data model and the UI repeatedly after a certain amount of
 	 * time.
-	 * 
+	 *
 	 * @param timeout the amount of time that passes between two requests sent to
 	 *                the server
 	 * @since Envoy v0.1-alpha
@@ -346,4 +350,14 @@ public class ChatWindow extends JFrame {
 	 * Marks messages in the current chat as {@code READ}.
 	 */
 	private void readCurrentChat() { if (currentChat != null) { localDB.setMessagesToRead(currentChat); } }
+
+	private void displayNotification(String message) throws AWTException {
+		SystemTray	tray		= SystemTray.getSystemTray();
+		Image		image		= Toolkit.getDefaultToolkit().createImage(getClass().getResource("Envoy Logo.png"));
+		TrayIcon	trayIcon	= new TrayIcon(image, "Envoy Client");
+		trayIcon.setImageAutoSize(true);
+		trayIcon.setToolTip("You are notified if you have unread messages.");
+		tray.add(trayIcon);
+		trayIcon.displayMessage("Envoy Client", message, MessageType.INFO);
+	}
 }