Refactor: use yoda notation to get error in case of mistyping

src/main/java/ChatClient.java

@@ -20,7 +20,7 @@ public class ChatClient extends JFrame implements KeyListener {
         super("Chat");
         address = JOptionPane.showInputDialog("bitte IP-Adresse");
         
-        if (address != null) {
+        if (null != address) {
             receiveMessages();
         }
     }
@@ -47,8 +47,8 @@ public class ChatClient extends JFrame implements KeyListener {
     private void receiveMessages() {
         try {
             connectionToServer = new Socket(address, Constants.PORT);
-            fromServerReader = new BufferedReader(new InputStreamReader(connectionToServer.getInputStream()));
-            toServerWriter = new PrintWriter(new OutputStreamWriter(connectionToServer.getOutputStream()));
+            fromServerReader   = new BufferedReader(new InputStreamReader(connectionToServer.getInputStream()));
+            toServerWriter     = new PrintWriter(new OutputStreamWriter(connectionToServer.getOutputStream()));
 
             initGui();