Figured out and corrected the bug in UserDatabase.createUser now its possible to add multiple users to the file without issues

Author: Madhavan7

src/main/java/UserDatabase.java

@@ -35,10 +35,10 @@ public boolean UserExists(String username, String email) {
     @Override
     public void createUser(String username, String password, String email, String type){
         User newUser = UserFactory.BirthUser(username, password, email, type);
+        this.accountList.add(newUser);
         try(FileOutputStream fileOut = new FileOutputStream(accounts)){
             try(ObjectOutputStream out = new ObjectOutputStream(fileOut)){
-                out.writeObject(newUser);
-                this.accountList.add(newUser);
+                out.writeObject(this.accountList);
                 out.close();
                 fileOut.close();
             }catch(Exception e){
@@ -66,19 +66,22 @@ public User getUser(String username) {
     public List<User> getList() {
         List<User> users = new ArrayList<>();
         try(FileInputStream fileIn = new FileInputStream(accounts);
-            ObjectInputStream in = new ObjectInputStream(fileIn)){
-            /*User user = (User) in.readObject();*/
+            ObjectInputStream in = new ObjectInputStream(fileIn)) {
+
+            users = (ArrayList<User>) in.readObject();
+            /*
             while(true){
                 try{
                     User user = (User) in.readObject();
                     users.add(user);}
                 catch(EOFException e){
                     break;
-                }
-            }
-        }catch(Exception e){
-            e.printStackTrace();
+                }*/
+            return users;
+        }catch(EOFException e){
+            return users;
+            } catch (IOException | ClassNotFoundException ex) {
+            throw new RuntimeException(ex);
         }
-        return users;
     }
 }

src/main/java/UserRegistrationUI.java

@@ -86,9 +86,11 @@ public void registerUser(String username, String password, String email) {
     }
     //For Testing purposes
     public static void main(String[] args){
-        UserDatabase testDB = new UserDatabase();
+        UserDatabase testDB = new UserDatabase(new File("Test4"));
         System.out.println(testDB.UserExists("RandomUser", "[email protected]"));
+        System.out.println(testDB.getList().size());
         UserRegistrationUI testUI = new UserRegistrationUI(testDB);
+
         testUI.GetUserCredentials();
     }
 

src/test/java/UserDatabaseTest.java

@@ -7,44 +7,45 @@
 public class UserDatabaseTest {
     @Test
     public void addingFilesRightEmailAndUser(){
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         accountDatabase.createUser("MadhavGopakumar", "123", "[email protected]", "Basic");
         Assertions.assertTrue(accountDatabase.UserExists("MadhavGopakumar", "[email protected]"));
     }
     @Test
     public void addingMultipleFiles(){
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         accountDatabase.createUser("MeenakshiGopakumar", "123", "[email protected]", "Basic");
         Assertions.assertTrue(accountDatabase.UserExists("MeenakshiGopakumar", "[email protected]"));
     }
     @Test
     public void rightEmailWrongUser(){
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         accountDatabase.createUser("MadhavGopakumar", "123", "[email protected]", "Basic");
         Assertions.assertTrue(accountDatabase.UserExists("MadG", "[email protected]"));
     }
     @Test
     public void rightUserWrongEmail(){
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         Assertions.assertTrue(accountDatabase.UserExists("MeenakshiGopakumar", "ma"));
     }
     @Test
     public void listedUsers(){
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         accountDatabase.createUser("MeenakshiGopakumar", "123", "[email protected]", "Basic");
         List<User> lst = accountDatabase.getList();
         String email = lst.get(0).getEmail();
+        System.out.println(email);
         Assertions.assertTrue(email.equals("[email protected]"));
     }
 
     @Test
     public void userGot() {
-        File accounts = new File("Test");
+        File accounts = new File("Test3");
         UserDatabase accountDatabase = new UserDatabase(accounts);
         accountDatabase.createUser("MeenakshiGopakumar", "123", "[email protected]", "Basic");
         User user = accountDatabase.getUser("MeenakshiGopakumar");