not Valid Command und Willkommens und schlussnachricht hinzugefügt

User.java

@@ -1,5 +1,5 @@
 public class User {
-    int connectionID;
+    String connectionID;
     String username;
     String password;
     int timesPlayed;
@@ -11,7 +11,7 @@ public class User {
     int [] wonInTurn;
     Game game;
 
-    public User (int pConnectionID){
+    public User (String pConnectionID){
         connectionID =pConnectionID;
         game = new Game();
     }
@@ -20,7 +20,7 @@ public class User {
         return game;
     }
     
-    public int getConnectionID() {
+    public String getConnectionID() {
         return connectionID;
     }
 
@@ -60,7 +60,7 @@ public class User {
         return username;
     }
 
-    public void setConnectionID(int connectionID) {
+    public void setConnectionID(String connectionID) {
         this.connectionID = connectionID;
     }