Added –Universally Unique Identifier for the user signing up

src/main/java/SignUp.java

@@ -1,25 +1,36 @@
 import com.google.gson.Gson;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.util.UUID;
 
 public class SignUp {
+	private String id;
     private String userName;
     private String password;
     private String birthday;
 
     // Constructor
-    public SignUp(String name, String password, String birthday) {
-    this.userName = name;
+    public SignUp(String id, String name, String password, String birthday) {
+    this.id = id;
+    	this.userName = name;
     this.password = password;
     this.birthday = birthday;
     }
 
     // Getters and Setters
+    public String getId() {
+        return id;
+        }
+
+        public void setId(String id) {
+        this.id = id;
+        }
+        
     public String getUserName() {
     return userName;
     }
 
-    public void setName(String userName) {
+    public void setUserName(String userName) {
     this.userName = userName;
     }
 
@@ -40,7 +51,7 @@ public class SignUp {
         }
 
     // Function to create user with validation
-    public static SignUp createUser(String userName, String password, String birthday) {
+    public static SignUp createUser(String id, String userName, String password, String birthday) {
     	if (userName == null || userName.isEmpty()) {
         throw new IllegalArgumentException("Username cannot be empty");
         }
@@ -49,7 +60,7 @@ public class SignUp {
         }
         if (password.length() < 6) {
         throw new IllegalArgumentException("Password must be at least 6 characters long");
-        }    return new SignUp(userName, password, birthday);
+        }    return new SignUp(id, userName, password, birthday);
     }
     
  // Function to save to JSON file, replace with database call later
@@ -66,9 +77,11 @@ public class SignUp {
     public static void main(String[] args) {
         try {
             // Example usage
-            SignUp user = createUser("Test User", "TestPasswort", "01.01.1900");
+        	UUID randomUUID = UUID.randomUUID();
+            SignUp user = createUser(randomUUID.toString(), "Test User", "TestPasswort", "01.01.1900");
 
             // Example of accessing properties
+            System.out.println("UserID: " + user.getId());
             System.out.println("User Name: " + user.getUserName());
             System.out.println("User Password: " + user.getPassword());
             System.out.println("User Birthday: " + user.getBirthday());

user.json

@@ -1 +1 @@
-{"userName":"Test User","password":"TestPasswort","birthday":"01.01.1900"}
+{"id":"48728bbb-b924-48ce-aac0-3e38d6c7878e","userName":"Test User","password":"TestPasswort","birthday":"01.01.1900"}