Separated out GameSupplier class to a file of its own.

src/main/java/inf101/v20/sem2/mnkgames/GUI/GUIMain.java

 package inf101.v20.sem2.mnkgames.GUI;
 
-import java.util.function.Supplier;
-import inf101.v20.sem2.mnkgames.ConnectFour;
-import inf101.v20.sem2.mnkgames.MNKGame;
-import inf101.v20.sem2.mnkgames.TicTacToe;
-
 public class GUIMain {
 
 	public static void main(String[] args) {
@@ -12,19 +7,3 @@ public class GUIMain {
 	}
 
 }
-class GameSupplier implements Supplier<MNKGame>{
-
-	@Override
-	public MNKGame get() {
-		return null;
-	}
-
-	public MNKGame getConnectFourGame() {
-		return new ConnectFour();
-	}
-
-	public MNKGame getTicTacToeGame() {
-		return new TicTacToe();
-	}
-
-}

src/main/java/inf101/v20/sem2/mnkgames/GUI/GameSupplier.java

+package inf101.v20.sem2.mnkgames.GUI;
+
+import inf101.v20.sem2.mnkgames.ConnectFour;
+import inf101.v20.sem2.mnkgames.MNKGame;
+import inf101.v20.sem2.mnkgames.TicTacToe;
+
+/**
+ * Simple class to return new instances of MNK games
+ * If your constructors are simple like here this class does nothing.
+ * But if the constructors need specific inputs that could be handled here.
+ * E.g. a list of players
+ * @author mva021
+ *
+ */
+class GameSupplier{
+
+	public MNKGame getConnectFourGame() {
+		return new ConnectFour();
+	}
+
+	public MNKGame getTicTacToeGame() {
+		return new TicTacToe();
+	}
+
+}